{
    "model": {
        "rank": 5328,
        "code": "thing-q905750",
        "model_id": "vr.tr.nitrous-oxide",
        "name": "nitrous oxide",
        "purpose": "Enable an AI agent to identify nitrous oxide, assess the composition and physical state of a particular supply, and determine which uses or handling actions its evidence supports.",
        "family": "Thing Registry",
        "category": "Physical world and living systems",
        "status": "research-draft",
        "kind": "thing",
        "plane": "PHY",
        "domain": "PHY.OBJ",
        "industry": "",
        "version": "",
        "url": "/models/thing/q905750/",
        "tier": 2,
        "score": 68,
        "payload": {
            "layer": "wikidata",
            "aliases": [
                "(¹⁵N₂)nitrous oxide",
                "(¹⁸O)Oxo(¹⁵N₂)-1λ⁵-diazyne"
            ],
            "aliasCount": 2,
            "merged": 2,
            "knownIn": 68,
            "facets": null,
            "markers": [],
            "lexicalClass": "",
            "senseRank": null,
            "alsoRegisteredAs": "vr.tr.nitrous-oxide",
            "source": {
                "dataset": "wikidata",
                "item": "Q905750",
                "url": "https://www.wikidata.org/wiki/Q905750",
                "license": "CC0 1.0"
            }
        },
        "research": {
            "vercy": "1.0-draft",
            "publication": {
                "status": "research-draft",
                "adjudicationStatus": "unreviewed",
                "publishableCanonical": false,
                "generatedAt": "2026-09-09T22:08:45Z",
                "providers": [
                    "Codex"
                ],
                "breadth": "recalled by Codex without web access - no source was read",
                "missingProviders": [],
                "pass": 2,
                "cost": {
                    "grok": {
                        "seconds": 24.7,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a08836-632c-7bf3-9677-eb16735626ae\n--------\nuser\nDescribe what is already known about one registered thing. Answer as JSON only, no prose around it.\n\nThing: nitrous oxide\nSense to describe: (none recorded)\nDomain code: PHY.OBJ\nAlso known as: (none)\n\n\nContext for this batch of 1001 things:\n# Batch 005: 1001 r",
                        "usd": 0,
                        "recall": true
                    },
                    "codex": {
                        "seconds": 65.2,
                        "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.4\n--------\nworkdir: R:\\02_PROJECTS\\02_Meta_Models_Platforms\\Ver.cy\\current\\thing-registry-backlog\nmodel: gpt-6-astra\nprovider: openai\napproval: never\nsandbox: read-only\nreasoning effort: none\nreasoning summaries: none\nsession id: 01a08836-633a-7091-8e10-f9b0e7832b6d\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: nitrous oxide\nRegistry id: vr.tr.nitrous-oxide\nPlane / domain: PHY / PHY.OBJ\nRegistry definition: (none recorded)\nNames folded into this entry: (none"
                    }
                }
            },
            "metaModel": {
                "id": "THING-Q905750",
                "registryId": "vr.tr.nitrous-oxide",
                "name": "nitrous oxide",
                "version": "0.1.0-research.1",
                "entryKind": "thing",
                "family": "Thing Registry",
                "domain": [
                    "PHY.OBJ"
                ],
                "status": "research-draft"
            },
            "canonicalUrl": "https://ver.cy/models/thing/q905750/",
            "model": {
                "registry_id": "vr.tr.nitrous-oxide",
                "name": "nitrous oxide",
                "purpose": "Enable an AI agent to identify nitrous oxide, assess the composition and physical state of a particular supply, and determine which uses or handling actions its evidence supports.",
                "definition": "Nitrous oxide (N₂O) is a molecular oxide of nitrogen consisting of two nitrogen atoms and one oxygen atom, occurring as a colourless gas at ordinary ambient conditions and exhibiting anaesthetic, oxidizing and greenhouse properties.",
                "scope_statement": "This model owns nitrous oxide as the chemical substance registered as vr.tr.nitrous-oxide in PHY / PHY.OBJ, including substance identity, grade, phase, condition-dependent properties, hazards, permitted applications, and environmental release.",
                "in_scope": [
                    "Chemical identity and distinction from other nitrogen oxides and nitrous-oxide-containing mixtures",
                    "Purity, impurities, grade, and evidence linking a supplied batch to its declared composition",
                    "Phase, pressure, temperature, inventory, and condition-dependent physical properties",
                    "Exposure, oxidizing behavior, pressure-related hazards, and application-specific suitability",
                    "Jurisdiction-specific substance classification and atmospheric release accounting"
                ],
                "out_of_scope": [
                    "Cylinder, valve, regulator, and dispensing-device design as independent equipment models",
                    "Clinical treatment protocols, patient selection, and anesthetic delivery procedures",
                    "Manufacturing plants, synthesis routes, and purification processes as operational systems",
                    "Food products, aerosol formulations, and gas mixtures that contain nitrous oxide",
                    "Engine systems and combustion processes that consume nitrous oxide"
                ],
                "distinguishing_features": [
                    "An identity record must resolve to N2O, rather than nitric oxide, nitrogen dioxide, nitrogen, or an unspecified nitrogen-oxide aggregate.",
                    "The name 'nitrous' or 'laughing gas' alone is insufficient: substance identifiers and composition evidence must establish the intended chemical identity.",
                    "A supply containing oxygen or another deliberately added gas must be distinguished from a nominally pure nitrous oxide supply.",
                    "Medical, food, and technical grade labels must be distinguished through their specifications and batch evidence; the shared chemical formula does not establish interchangeable suitability.",
                    "A pressurized supply must distinguish gas-only contents from contents with a liquid phase rather than treating every gas-labeled container as physically equivalent."
                ],
                "characteristics": [
                    {
                        "name": "Chemical identity",
                        "kind": "category",
                        "unit_or_values": "Molecular formula N2O; verified CAS, PubChem CID, and EC identifiers",
                        "why_it_matters": "Prevents confusion with other nitrogen oxides and connects evidence across registries."
                    },
                    {
                        "name": "Nitrous oxide content",
                        "kind": "measurement",
                        "unit_or_values": "Mole fraction, volume fraction, or mass fraction with analytical basis and uncertainty",
                        "why_it_matters": "Separates substance purity from mixture composition and supports specification checks."
                    },
                    {
                        "name": "Impurity profile",
                        "kind": "measurement",
                        "unit_or_values": "Concentrations of specified contaminants, including moisture and other nitrogen oxides, with units and detection limits",
                        "why_it_matters": "A total purity percentage may conceal contaminants relevant to a particular use."
                    },
                    {
                        "name": "Declared grade and specification",
                        "kind": "category",
                        "unit_or_values": "Medical, food, technical, or other declared grade; named specification and version",
                        "why_it_matters": "Connects intended use to explicit quality requirements."
                    },
                    {
                        "name": "Batch evidence",
                        "kind": "relation",
                        "unit_or_values": "Supplier, batch identifier, certificate of analysis, sampling date, and chain of custody",
                        "why_it_matters": "Establishes whether composition claims apply to the actual supply."
                    },
                    {
                        "name": "Physical state",
                        "kind": "state",
                        "unit_or_values": "Gas, liquid, gas-liquid coexistence, solid, or supercritical state at recorded conditions",
                        "why_it_matters": "Determines which inventory, transfer, and pressure relationships apply."
                    },
                    {
                        "name": "Temperature and absolute pressure",
                        "kind": "measurement",
                        "unit_or_values": "K or °C; Pa, kPa, or bar absolute",
                        "why_it_matters": "Makes phase and physical-property observations interpretable."
                    },
                    {
                        "name": "Reference physical properties",
                        "kind": "measurement",
                        "unit_or_values": "Molar mass in g/mol; melting and boiling temperatures with pressure; critical temperature and pressure; density at stated conditions",
                        "why_it_matters": "Supports identification and condition-dependent assessment without treating constants as universally applicable."
                    },
                    {
                        "name": "Available quantity",
                        "kind": "measurement",
                        "unit_or_values": "kg or mol; gas volume only with reference temperature and pressure",
                        "why_it_matters": "Supports inventory and release estimates while avoiding unsupported pressure-only quantity estimates."
                    },
                    {
                        "name": "Hazard and regulatory classification",
                        "kind": "category",
                        "unit_or_values": "Applicable GHS implementation, transport classification, jurisdiction, source, and revision date",
                        "why_it_matters": "Connects the supplied form to current handling and transport obligations."
                    },
                    {
                        "name": "Airborne exposure",
                        "kind": "measurement",
                        "unit_or_values": "ppm or mg/m³ with sampling location, duration, method, and applicable exposure-limit basis",
                        "why_it_matters": "Supports assessment of workplace exposure and control performance."
                    },
                    {
                        "name": "Released nitrous oxide",
                        "kind": "measurement",
                        "unit_or_values": "kg N2O per event or reporting period; CO2-equivalent only with named assessment basis and time horizon",
                        "why_it_matters": "Keeps measured substance releases distinct from derived climate accounting."
                    }
                ],
                "affordances": [
                    "Resolve a label or supplier record to nitrous oxide and flag ambiguous nitrogen-oxide terminology.",
                    "Compare batch composition and grade evidence against a specified intended-use requirement.",
                    "Assess phase and inventory using recorded conditions and an appropriate property model.",
                    "Screen proposed storage, transfer, or use against documented compatibility and hazard constraints.",
                    "Compare measured airborne concentrations with a selected, applicable exposure criterion.",
                    "Reconcile purchased, consumed, recovered, and released nitrous oxide for environmental reporting."
                ]
            },
            "sources": [],
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-substance-boundary",
                        "name": "Identity and substance boundary",
                        "description": "Establishes which chemical entity and supplied composition the record represents.",
                        "rationale": "Nitrous oxide can be confused with other nitrogen oxides, informal names, and mixtures sold for particular applications.",
                        "layers": [
                            {
                                "id": "chemical-identity",
                                "name": "Chemical identity",
                                "description": "Connects N2O to authoritative substance identifiers and names.",
                                "findings": [
                                    {
                                        "id": "nitrous-oxide-identity-evidence",
                                        "name": "Nitrous oxide identity evidence",
                                        "description": "Record the evidence that a name or identifier denotes nitrous oxide rather than another nitrogen-containing gas.",
                                        "questions": [
                                            {
                                                "text": "Which authoritative records establish the formula, CAS number, PubChem CID, and EC number for this substance?",
                                                "kind": "provenance",
                                                "id": "nitrous-oxide-identity-evidence-q01"
                                            },
                                            {
                                                "text": "Does the supplied name denote N2O specifically, or an ambiguous nitrogen-oxide term?",
                                                "kind": "definition",
                                                "id": "nitrous-oxide-identity-evidence-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "substance-versus-mixture",
                                "name": "Substance versus mixture",
                                "description": "Separates nitrous oxide from intentionally formulated mixtures and containing products.",
                                "findings": [
                                    {
                                        "id": "supplied-composition-boundary",
                                        "name": "Supplied composition boundary",
                                        "description": "Identify whether the supply is nominally pure nitrous oxide, a blend, or a product containing it.",
                                        "questions": [
                                            {
                                                "text": "Are oxygen or other gases deliberately added, and what composition is declared?",
                                                "kind": "boundary",
                                                "id": "supplied-composition-boundary-q01"
                                            },
                                            {
                                                "text": "Which properties belong to the nitrous oxide component, and which must be assessed in a separate mixture or product model?",
                                                "kind": "boundary",
                                                "id": "supplied-composition-boundary-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "grade-and-quality-evidence",
                        "name": "Grade and quality evidence",
                        "description": "Relates measured composition to batch traceability and intended-use specifications.",
                        "rationale": "Chemical identity alone cannot establish whether a supply is suitable for medical, food, or technical applications.",
                        "layers": [
                            {
                                "id": "composition-assurance",
                                "name": "Composition assurance",
                                "description": "Captures assay results and contaminants that may limit suitability.",
                                "findings": [
                                    {
                                        "id": "assay-and-impurity-profile",
                                        "name": "Assay and impurity profile",
                                        "description": "Record nitrous oxide content and specification-relevant impurities with analytical limitations.",
                                        "questions": [
                                            {
                                                "text": "What nitrous oxide content was measured, on what compositional basis, and with what uncertainty?",
                                                "kind": "measurement",
                                                "id": "assay-and-impurity-profile-q01"
                                            },
                                            {
                                                "text": "Which contaminants were tested, including moisture and other nitrogen oxides, and what were the results and detection limits?",
                                                "kind": "measurement",
                                                "id": "assay-and-impurity-profile-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "grade-qualification",
                                "name": "Grade qualification",
                                "description": "Tests whether declared grade is supported for the actual batch and proposed use.",
                                "findings": [
                                    {
                                        "id": "specification-to-batch-link",
                                        "name": "Specification-to-batch link",
                                        "description": "Connect the grade claim to a named standard, certificate, and identifiable supply.",
                                        "questions": [
                                            {
                                                "text": "Which specification and version define the declared grade, and does the certificate cover this batch?",
                                                "kind": "provenance",
                                                "id": "specification-to-batch-link-q01"
                                            },
                                            {
                                                "text": "What additional qualification is required before this supply may be accepted for the proposed application?",
                                                "kind": "action",
                                                "id": "specification-to-batch-link-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "phase-pressure-and-inventory",
                        "name": "Phase, pressure, and inventory",
                        "description": "Describes nitrous oxide under actual storage or use conditions.",
                        "rationale": "Phase and temperature affect pressure, withdrawal behavior, and the interpretation of remaining quantity.",
                        "layers": [
                            {
                                "id": "thermophysical-state",
                                "name": "Thermophysical state",
                                "description": "Locates the supply relative to phase boundaries using sourced property data.",
                                "findings": [
                                    {
                                        "id": "condition-dependent-phase",
                                        "name": "Condition-dependent phase",
                                        "description": "Associate phase claims and physical properties with measured temperature and absolute pressure.",
                                        "questions": [
                                            {
                                                "text": "At the recorded temperature and absolute pressure, which phase or phase coexistence does the selected property reference support?",
                                                "kind": "measurement",
                                                "id": "condition-dependent-phase-q01"
                                            },
                                            {
                                                "text": "Which sources establish melting, boiling, and critical conditions, and what reference conditions or validity limits accompany them?",
                                                "kind": "provenance",
                                                "id": "condition-dependent-phase-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "quantity-and-withdrawal",
                                "name": "Quantity and withdrawal",
                                "description": "Relates available mass and withdrawal state to the physical supply.",
                                "findings": [
                                    {
                                        "id": "inventory-estimation-basis",
                                        "name": "Inventory estimation basis",
                                        "description": "Record how remaining nitrous oxide is determined and whether gas or liquid is being withdrawn.",
                                        "questions": [
                                            {
                                                "text": "Is remaining quantity established by weighing, metered flow, or a validated state model, and how is measurement uncertainty handled?",
                                                "kind": "measurement",
                                                "id": "inventory-estimation-basis-q01"
                                            },
                                            {
                                                "text": "Does the proposed withdrawal involve gas or liquid, and which temperature and pressure constraints must be checked against the linked equipment record?",
                                                "kind": "action",
                                                "id": "inventory-estimation-basis-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "hazards-and-exposure-controls",
                        "name": "Hazards and exposure controls",
                        "description": "Captures evidence needed to assess chemical, physical, and inhalation hazards.",
                        "rationale": "Nitrous oxide requires separate assessment of combustion support, pressurized supply, and inhalation exposure.",
                        "layers": [
                            {
                                "id": "reactivity-and-handling",
                                "name": "Reactivity and handling",
                                "description": "Connects oxidizing behavior and physical state to documented handling constraints.",
                                "findings": [
                                    {
                                        "id": "compatibility-and-instability-conditions",
                                        "name": "Compatibility and instability conditions",
                                        "description": "Record supported restrictions concerning combustible contamination, incompatible materials, heating, and decomposition.",
                                        "questions": [
                                            {
                                                "text": "Which authoritative safety sources identify incompatible substances and conditions that can intensify combustion or trigger hazardous decomposition?",
                                                "kind": "provenance",
                                                "id": "compatibility-and-instability-conditions-q01"
                                            },
                                            {
                                                "text": "What verified compatibility, cleanliness, and operating limits govern the proposed storage or transfer?",
                                                "kind": "action",
                                                "id": "compatibility-and-instability-conditions-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "inhalation-exposure",
                                "name": "Inhalation exposure",
                                "description": "Separates intended clinical administration from unintended workplace or environmental exposure.",
                                "findings": [
                                    {
                                        "id": "exposure-evidence-and-response",
                                        "name": "Exposure evidence and response",
                                        "description": "Capture exposure duration, concentration, applicable criteria, and documented control requirements.",
                                        "questions": [
                                            {
                                                "text": "What airborne nitrous oxide concentration and exposure duration were measured, and does the sampling method support comparison with the selected limit?",
                                                "kind": "measurement",
                                                "id": "exposure-evidence-and-response-q01"
                                            },
                                            {
                                                "text": "Which authoritative guidance addresses acute impairment, oxygen displacement, and vitamin B12-related effects, and what control or escalation actions does it require?",
                                                "kind": "action",
                                                "id": "exposure-evidence-and-response-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "use-authorization-and-environmental-fate",
                        "name": "Use authorization and environmental fate",
                        "description": "Links an intended application to applicable requirements and accounts for nitrous oxide leaving controlled use.",
                        "rationale": "Acceptable use depends on grade and jurisdiction, while releases require substance-specific environmental accounting.",
                        "layers": [
                            {
                                "id": "application-and-regulatory-status",
                                "name": "Application and regulatory status",
                                "description": "Records the intended function and the legal or standards basis for acceptance.",
                                "findings": [
                                    {
                                        "id": "application-specific-eligibility",
                                        "name": "Application-specific eligibility",
                                        "description": "Assess medical, food, technical, or other use against current requirements without transferring eligibility between applications.",
                                        "questions": [
                                            {
                                                "text": "What function will the nitrous oxide serve, and which grade, authorization, and supply conditions apply in the relevant jurisdiction?",
                                                "kind": "action",
                                                "id": "application-specific-eligibility-q01"
                                            },
                                            {
                                                "text": "Which current sources establish the applicable hazard labeling, transport identity, and restrictions for the supplied form?",
                                                "kind": "provenance",
                                                "id": "application-specific-eligibility-q02"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "release-and-atmospheric-impact",
                                "name": "Release and atmospheric impact",
                                "description": "Distinguishes emitted nitrous oxide mass from climate and ozone-impact assessments.",
                                "findings": [
                                    {
                                        "id": "nitrous-oxide-release-accounting",
                                        "name": "Nitrous oxide release accounting",
                                        "description": "Track release pathways and preserve the assessment basis behind environmental impact claims.",
                                        "questions": [
                                            {
                                                "text": "How much N2O is released through use, leakage, or disposal, and which quantities are measured versus estimated?",
                                                "kind": "measurement",
                                                "id": "nitrous-oxide-release-accounting-q01"
                                            },
                                            {
                                                "text": "Which assessment source and time horizon support climate conversion factors, and which separate evidence supports claims about stratospheric ozone effects?",
                                                "kind": "provenance",
                                                "id": "nitrous-oxide-release-accounting-q02"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "evidence-and-external-alignment",
                        "name": "Evidence and external alignment",
                        "description": "What the world already says about this thing, gathered so the model can be checked against it.",
                        "rationale": "A model that cannot be lined up against existing standards, identifiers and practice cannot be adopted by anyone who already uses them.",
                        "layers": [
                            {
                                "id": "reported-evidence",
                                "name": "Reported evidence",
                                "description": "Findings from the breadth pass, kept separate from the structural claims.",
                                "findings": [
                                    {
                                        "id": "evidence-confidence-notes",
                                        "name": "Check these first",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "This is recalled knowledge, not a researched or source-verified account.",
                                            "Grades are distinguished by purity, impurity limits and intended use, not by different molecular identities; verify the applicable monograph or product specification.",
                                            "Check current jurisdiction-specific hazard classifications, exposure limits and supply restrictions before operational use."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-confidence-notes-q01",
                                                "text": "Which of these check these first hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-kinds",
                                        "name": "Kinds and varieties",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Medical-grade nitrous oxide",
                                            "Food-grade nitrous oxide",
                                            "Industrial-grade nitrous oxide",
                                            "High-purity analytical nitrous oxide"
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-kinds-q01",
                                                "text": "Which of these kinds and varieties hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-identifiers",
                                        "name": "Identifiers and schemes",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "scheme": "CAS Registry Number",
                                                "value_or_pattern": "10024-97-2",
                                                "note": "Identifies nitrous oxide as a chemical substance, without specifying grade."
                                            },
                                            {
                                                "scheme": "PubChem CID",
                                                "value_or_pattern": "948",
                                                "note": "Compound identifier for nitrous oxide."
                                            },
                                            {
                                                "scheme": "EC number",
                                                "value_or_pattern": "233-032-0",
                                                "note": "European chemical inventory identifier."
                                            },
                                            {
                                                "scheme": "UN dangerous goods number",
                                                "value_or_pattern": "UN 1070",
                                                "note": "Transport identifier for nitrous oxide; refrigerated liquid has a separate entry."
                                            },
                                            {
                                                "scheme": "European food additive E number",
                                                "value_or_pattern": "E 942",
                                                "note": "Food additive identity; does not establish that a particular supply meets food-grade requirements."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-identifiers-q01",
                                                "text": "Which of these identifiers and schemes hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-standards-and-regulation",
                                        "name": "Standards and regulation",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "United Nations Globally Harmonized System of Classification and Labelling of Chemicals provides the framework for communicating oxidizing-gas and pressure hazards.",
                                            "United Nations Recommendations on the Transport of Dangerous Goods provide transport entries and classifications for nitrous oxide.",
                                            "European Pharmacopoeia, maintained by the Council of Europe's EDQM, includes requirements for medicinal nitrous oxide.",
                                            "United States Pharmacopeia-National Formulary, published by USP, includes a nitrous oxide monograph."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-standards-and-regulation-q01",
                                                "text": "Which of these standards and regulation hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-real-world-use",
                                        "name": "Real-world use",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Inhaled analgesia and adjunctive anaesthesia in controlled medical and dental settings.",
                                            "Food propellant, especially for whipping cream.",
                                            "Oxidizer in rocket propulsion.",
                                            "Oxidizer supply in some internal-combustion engine performance systems.",
                                            "Oxidizing process gas in semiconductor fabrication."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-real-world-use-q01",
                                                "text": "Which of these real-world use hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-measurements",
                                        "name": "Typical measurements",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "quantity": "Molar mass",
                                                "typical_range": "44.013",
                                                "unit": "g/mol"
                                            },
                                            {
                                                "quantity": "Normal boiling point at approximately 101.325 kPa",
                                                "typical_range": "Approximately -88.5",
                                                "unit": "°C"
                                            },
                                            {
                                                "quantity": "Melting point",
                                                "typical_range": "Approximately -90.8",
                                                "unit": "°C"
                                            },
                                            {
                                                "quantity": "Critical temperature",
                                                "typical_range": "Approximately 36.4",
                                                "unit": "°C"
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-measurements-q01",
                                                "text": "Which of these typical measurements hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-failure-modes-and-hazards",
                                        "name": "Failure modes and hazards",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Can displace oxygen and cause hypoxia, unconsciousness or death when inhaled without adequate oxygen.",
                                            "Repeated or prolonged exposure can inactivate vitamin B12 and cause neurological and haematological injury.",
                                            "Supports combustion despite being nonflammable; contamination or severe heating can contribute to violent decomposition.",
                                            "Liquefied gas can cause cold burns, and pressurized containers can rupture when heated.",
                                            "Atmospheric emissions contribute to long-lived greenhouse warming and stratospheric ozone depletion."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-failure-modes-and-hazards-q01",
                                                "text": "Which of these failure modes and hazards hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-regional-variation",
                                        "name": "Regional variation",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            "Medicinal and food uses are governed by jurisdiction-specific authorization, purity and labelling requirements.",
                                            "Occupational exposure limits and their averaging periods differ between authorities.",
                                            "Restrictions on consumer sale, possession and recreational supply vary by jurisdiction."
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-regional-variation-q01",
                                                "text": "Which of these regional variation hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    },
                                    {
                                        "id": "evidence-neighbours",
                                        "name": "Neighbouring kinds and how to tell them apart",
                                        "description": "Recalled without web access and unsourced; every item is a lead to verify.",
                                        "evidence": [
                                            {
                                                "name": "Nitric oxide",
                                                "difference": "Nitric oxide is NO, with one nitrogen atom per oxygen atom, and has different chemical reactivity and physiological functions."
                                            },
                                            {
                                                "name": "Nitrogen dioxide",
                                                "difference": "Nitrogen dioxide is NO₂, a brown, strongly irritating gas with two oxygen atoms per nitrogen atom."
                                            },
                                            {
                                                "name": "Nitrous oxide-oxygen medical mixture",
                                                "difference": "A formulated mixture contains specified proportions of N₂O and O₂; it is not the pure substance."
                                            },
                                            {
                                                "name": "Whipped-cream charger",
                                                "difference": "A charger is a pressure-containing product that may contain nitrous oxide; the container and its specifications are distinct from the substance."
                                            }
                                        ],
                                        "questions": [
                                            {
                                                "id": "evidence-neighbours-q01",
                                                "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of nitrous oxide this model covers, and on what evidence?",
                                                "kind": "provenance"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "openQuestions": [
                "Which authoritative identity and thermophysical references should supply verified identifiers, numerical constants, and their conditions of applicability?",
                "Which jurisdictions and intended applications must the first completed model cover for grade specifications, labeling, transport, and use restrictions?",
                "Which impurity limits and analytical methods distinguish the relevant medical, food, and technical supplies?",
                "Which exposure criteria and compatibility or decomposition guidance apply to the actual storage, transfer, and use conditions?",
                "Which reporting framework, climate assessment version, and release-estimation method should govern environmental accounting?"
            ],
            "statistics": {
                "bundles": 6,
                "layers": 11,
                "findings": 19,
                "questions": 29
            }
        },
        "draft": {
            "generator": "vr.draft.v3",
            "status": "draft-generated",
            "researched": false,
            "archetype": "chemical substance or material",
            "method": "Written from the archetype playbook - what this kind of thing needs beyond identity and provenance - and from the structure that recurred across 6,333 models already researched by two engines. Applied to this entry by rule. No source was read for this thing and no claim here is researched. This entry carries no facets of its own, so they were inferred from its domain - a guess about a whole domain applied to one thing.",
            "facetsInferred": true,
            "nextPass": "A researcher replaces this draft with a sourced specification. Treat every sentence below as a proposal to argue with.",
            "purpose": "Give an agent a durable, checkable way to recognise a nitrous oxide, record what state it is in, and decide what may be done with it.",
            "whatItIs": "Enable an AI agent to identify nitrous oxide, assess the composition and physical state of a particular supply, and determine which uses or handling actions its evidence supports.",
            "characteristics": {
                "substance": "material",
                "origin": "manufactured",
                "agency": "inert",
                "mobility": "varies"
            },
            "whatYouCanDoWithIt": [
                "observed and measured"
            ],
            "distinguishingFeatures": [
                "Names folded into this entry, which a task may need to split apart again: (¹⁵N₂)nitrous oxide, (¹⁸O)Oxo(¹⁵N₂)-1λ⁵-diazyne.",
                "2 finer distinctions are held as aliases rather than separate entries, because telling them apart needs a task that asks for it.",
                "Described in 68 Wikipedia languages, which is a measure of how widely the thing is known, not of how important it is."
            ],
            "openQuestionsForResearch": [
                "Which of the bundles below does a real task actually need, and which are ceremony?",
                "What does this thing have that the facets do not capture at all?",
                "Which neighbouring kind is most often confused with a nitrous oxide, and on what evidence are they told apart?"
            ],
            "whatItIsMadeOf": "matter you can touch",
            "physicalCharacter": [
                "Mobility varies between examples.",
                "Does nothing on its own; everything it does, something else did to it.",
                "These come from the domain this entry sits in rather than from the entry itself, so treat them as a first guess about the whole domain applied to one thing."
            ],
            "whatCanBeDoneWithIt": [
                "observe it, measure it, record its state"
            ],
            "howItIsRecognised": [
                "Not recognisable by sight in any reliable way. Appearance varies with grade, form and additives; identification is by label, by documentation, or by assay."
            ],
            "relatedModels": [
                {
                    "relation": "covers",
                    "note": "Finer kinds folded into this entry because telling them apart needs a task that asks for it. Each is a model waiting to be split out when one does.",
                    "targets": [
                        "(¹⁵N₂)nitrous oxide",
                        "(¹⁸O)Oxo(¹⁵N₂)-1λ⁵-diazyne"
                    ]
                }
            ],
            "standing": "Described in 68 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is. 2 finer distinctions are held inside this entry as names rather than as separate models.",
            "structure": {
                "bundles": [
                    {
                        "id": "identity-and-classification",
                        "name": "Identity, naming and classification",
                        "description": "How an agent tells one nitrous oxide from another, and a nitrous oxide from things that resemble it.",
                        "rationale": "Recognition comes before every other claim. Without stable identity nothing else in the model can be trusted to be about the same thing twice.",
                        "layers": [
                            {
                                "id": "naming-and-identifiers",
                                "name": "Names and identifiers",
                                "description": "The names this thing goes by and the identifiers that survive translation and time.",
                                "findings": [
                                    {
                                        "id": "preferred-name-and-aliases",
                                        "name": "Preferred name, aliases and local names",
                                        "description": "Which name to use, which names mean the same thing, and which merely sound similar.",
                                        "questions": [
                                            {
                                                "id": "preferred-name-and-aliases-q01",
                                                "text": "What identifies and describes the name of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "preferred-name-and-aliases-q02",
                                                "text": "Who or what asserted this about the name of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "preferred-name-and-aliases-q03",
                                                "text": "What may an agent decide or do once the name of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    },
                                    {
                                        "id": "stable-identifiers",
                                        "name": "Stable identifiers and external keys",
                                        "description": "Identifiers that keep pointing at this kind of thing across systems and languages.",
                                        "questions": [
                                            {
                                                "id": "stable-identifiers-q01",
                                                "text": "What identifies and describes an identifier for a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "stable-identifiers-q02",
                                                "text": "Who or what asserted this about an identifier for a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "stable-identifiers-q03",
                                                "text": "What may an agent decide or do once an identifier for a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "classification-and-granularity",
                                "name": "Classification and granularity",
                                "description": "Where a nitrous oxide sits among kinds, and how finely a task needs to cut it.",
                                "findings": [
                                    {
                                        "id": "kind-and-parents",
                                        "name": "Kind, parents and neighbouring kinds",
                                        "description": "The classes this thing belongs to and the ones it is next to.",
                                        "questions": [
                                            {
                                                "id": "kind-and-parents-q01",
                                                "text": "What identifies and describes the kind of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "kind-and-parents-q02",
                                                "text": "Who or what asserted this about the kind of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "kind-and-parents-q03",
                                                "text": "What may an agent decide or do once the kind of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    },
                                    {
                                        "id": "distinguishing-features",
                                        "name": "Distinguishing features",
                                        "description": "What separates a nitrous oxide from the things most often confused with it.",
                                        "questions": [
                                            {
                                                "id": "distinguishing-features-q01",
                                                "text": "What identifies and describes what distinguishes a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "distinguishing-features-q02",
                                                "text": "Who or what asserted this about what distinguishes a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "distinguishing-features-q03",
                                                "text": "What may an agent decide or do once what distinguishes a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "form-and-composition",
                        "name": "Form, composition and condition",
                        "description": "What a nitrous oxide is made of, what shape and size it takes, and what state it is in.",
                        "rationale": "A physical thing can be measured, and a model that cannot record its measurements cannot support any decision that depends on them.",
                        "layers": [
                            {
                                "id": "form-and-dimensions",
                                "name": "Form and dimensions",
                                "description": "Shape, size, mass and the ranges these take across examples.",
                                "findings": [
                                    {
                                        "id": "measurable-dimensions",
                                        "name": "Measurable dimensions and their units",
                                        "description": "The quantities worth recording and the units they are recorded in.",
                                        "questions": [
                                            {
                                                "id": "measurable-dimensions-q01",
                                                "text": "What identifies and describes the dimensions of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "measurable-dimensions-q02",
                                                "text": "Who or what asserted this about the dimensions of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "measurable-dimensions-q03",
                                                "text": "What may an agent decide or do once the dimensions of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "material-and-composition",
                                "name": "Material and composition",
                                "description": "Materials, parts and how they are put together.",
                                "findings": [
                                    {
                                        "id": "parts-and-materials",
                                        "name": "Parts and materials",
                                        "description": "What a nitrous oxide is built from and which parts are replaceable.",
                                        "questions": [
                                            {
                                                "id": "parts-and-materials-q01",
                                                "text": "What identifies and describes the composition of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "parts-and-materials-q02",
                                                "text": "Who or what asserted this about the composition of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "parts-and-materials-q03",
                                                "text": "What may an agent decide or do once the composition of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "condition-and-integrity",
                                "name": "Condition and integrity",
                                "description": "Wear, damage, health and the difference between working and broken.",
                                "findings": [
                                    {
                                        "id": "condition-assessment",
                                        "name": "Condition, damage and health",
                                        "description": "How the condition of a nitrous oxide is judged and by whom.",
                                        "questions": [
                                            {
                                                "id": "condition-assessment-q01",
                                                "text": "What identifies and describes the condition of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "condition-assessment-q02",
                                                "text": "Who or what asserted this about the condition of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "condition-assessment-q03",
                                                "text": "What may an agent decide or do once the condition of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "place-and-movement",
                        "name": "Place and movement",
                        "description": "Where a nitrous oxide is, how it got there and where it may go (varies).",
                        "rationale": "A thing that can move needs its position recorded with a time, or every later claim about it is about a place it has left.",
                        "layers": [
                            {
                                "id": "location-and-placement",
                                "name": "Location and placement",
                                "description": "Position, containment and the reference frame the position is given in.",
                                "findings": [
                                    {
                                        "id": "position-and-frame",
                                        "name": "Position, container and reference frame",
                                        "description": "Where a nitrous oxide is, and what that position is measured against.",
                                        "questions": [
                                            {
                                                "id": "position-and-frame-q01",
                                                "text": "What identifies and describes the location of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "position-and-frame-q02",
                                                "text": "Who or what asserted this about the location of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "position-and-frame-q03",
                                                "text": "What may an agent decide or do once the location of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "movement-and-transfer",
                                "name": "Movement and transfer",
                                "description": "How a nitrous oxide is carried, installed or relocated.",
                                "findings": [
                                    {
                                        "id": "movement-events",
                                        "name": "Movement events and constraints",
                                        "description": "What counts as a movement, what records it and what limits it.",
                                        "questions": [
                                            {
                                                "id": "movement-events-q01",
                                                "text": "What identifies and describes the movement of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "movement-events-q02",
                                                "text": "Who or what asserted this about the movement of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "movement-events-q03",
                                                "text": "What may an agent decide or do once the movement of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "state-and-lifecycle",
                        "name": "State and lifecycle",
                        "description": "The states a nitrous oxide passes through and the events that move it between them.",
                        "rationale": "Most decisions about a thing depend on what state it is in now, which is a claim with a time on it, not a property.",
                        "layers": [
                            {
                                "id": "lifecycle-stages",
                                "name": "Lifecycle stages",
                                "description": "From coming into existence to ceasing to be one of these.",
                                "findings": [
                                    {
                                        "id": "stages-and-transitions",
                                        "name": "Stages and transitions",
                                        "description": "The stages worth naming and what moves a nitrous oxide between them.",
                                        "questions": [
                                            {
                                                "id": "stages-and-transitions-q01",
                                                "text": "What identifies and describes the lifecycle of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "stages-and-transitions-q02",
                                                "text": "Who or what asserted this about the lifecycle of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "stages-and-transitions-q03",
                                                "text": "What may an agent decide or do once the lifecycle of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "observations-and-status",
                                "name": "Observations and current status",
                                "description": "What is observed about a nitrous oxide, how often and by whom.",
                                "findings": [
                                    {
                                        "id": "observation-record",
                                        "name": "Observation record",
                                        "description": "How an observation of a nitrous oxide is recorded so that it can be superseded rather than overwritten.",
                                        "questions": [
                                            {
                                                "id": "observation-record-q01",
                                                "text": "What identifies and describes an observation of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "observation-record-q02",
                                                "text": "Who or what asserted this about an observation of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "observation-record-q03",
                                                "text": "What may an agent decide or do once an observation of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "use-and-operation",
                        "name": "Use and operation",
                        "description": "What can be done with a nitrous oxide and what it takes to do it.",
                        "rationale": "An agent that can recognise a thing but not act on it has only half a model.",
                        "layers": [
                            {
                                "id": "intended-use",
                                "name": "Intended use and function",
                                "description": "What a nitrous oxide is for, and what it is used for anyway.",
                                "findings": [
                                    {
                                        "id": "function-and-purpose",
                                        "name": "Function, purpose and misuse",
                                        "description": "The function a nitrous oxide performs and the uses that fall outside it.",
                                        "questions": [
                                            {
                                                "id": "function-and-purpose-q01",
                                                "text": "What identifies and describes the use of a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "function-and-purpose-q02",
                                                "text": "Who or what asserted this about the use of a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "function-and-purpose-q03",
                                                "text": "What may an agent decide or do once the use of a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "handling-and-procedure",
                                "name": "Handling and procedure",
                                "description": "The steps, skills and tools involved in using a nitrous oxide.",
                                "findings": [
                                    {
                                        "id": "procedures-and-skills",
                                        "name": "Procedures, skills and required tools",
                                        "description": "What an agent needs before it can act on a nitrous oxide at all.",
                                        "questions": [
                                            {
                                                "id": "procedures-and-skills-q01",
                                                "text": "What identifies and describes handling a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "procedures-and-skills-q02",
                                                "text": "Who or what asserted this about handling a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "procedures-and-skills-q03",
                                                "text": "What may an agent decide or do once handling a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "composition-and-identity",
                        "name": "Composition, grade and chemical identity",
                        "description": "What nitrous oxide is made of and how pure the thing in hand is.",
                        "rationale": "Grade decides what a substance may be used for, so a model that records only the name cannot support any decision about use.",
                        "layers": [
                            {
                                "id": "chemical-identity",
                                "name": "Chemical identity",
                                "description": "Formula, structure and the registry numbers that name it unambiguously.",
                                "findings": [
                                    {
                                        "id": "identity-record",
                                        "name": "Identity and registry numbers",
                                        "description": "What identifies this substance across suppliers and regulators.",
                                        "questions": [
                                            {
                                                "id": "identity-record-q01",
                                                "text": "What formula, structure and registry identifiers name nitrous oxide unambiguously?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "identity-record-q02",
                                                "text": "Which related substances share a name in common use but not an identifier?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "grade-and-impurities",
                                "name": "Grade, purity and impurities",
                                "description": "The specification a batch meets and what else is in it.",
                                "findings": [
                                    {
                                        "id": "specification",
                                        "name": "Specification and assay",
                                        "description": "How purity is stated and measured, and which impurities matter.",
                                        "questions": [
                                            {
                                                "id": "specification-q01",
                                                "text": "What grades of nitrous oxide exist, how is purity assayed, and which impurities are limited?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "specification-q02",
                                                "text": "Which use requires which grade, and what happens when a lower grade is substituted?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "properties-and-behaviour",
                        "name": "Properties and behaviour",
                        "description": "How nitrous oxide behaves under conditions an agent can measure or change.",
                        "rationale": "Physical constants are the part of a substance model that transfers between contexts, and each needs its unit and its conditions.",
                        "layers": [
                            {
                                "id": "physical-constants",
                                "name": "Physical constants",
                                "description": "Values that hold for the pure substance, with their conditions.",
                                "findings": [
                                    {
                                        "id": "constants-record",
                                        "name": "Constants and conditions",
                                        "description": "The quantities worth recording and the state they apply in.",
                                        "questions": [
                                            {
                                                "id": "constants-record-q01",
                                                "text": "What are the defining physical constants of nitrous oxide, in what units and under what conditions?",
                                                "kind": "measurement"
                                            },
                                            {
                                                "id": "constants-record-q02",
                                                "text": "Which of these values change with grade or form rather than being fixed?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "stability-and-reactivity",
                                "name": "Stability and reactivity",
                                "description": "What it reacts with, degrades into, and how it is stored.",
                                "findings": [
                                    {
                                        "id": "incompatibilities",
                                        "name": "Incompatibilities and degradation",
                                        "description": "What must not meet it, and what it becomes over time.",
                                        "questions": [
                                            {
                                                "id": "incompatibilities-q01",
                                                "text": "What is nitrous oxide incompatible with, and what does it degrade into under storage?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "incompatibilities-q02",
                                                "text": "What storage and handling does that require, and who is competent to do it?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "hazard-and-regulation",
                        "name": "Hazard classification and regulation",
                        "description": "How nitrous oxide can harm, and what the law says about holding and moving it.",
                        "rationale": "A substance model without its hazard class and its regulatory identity is unusable in exactly the situations that matter.",
                        "layers": [
                            {
                                "id": "hazard-class",
                                "name": "Hazard classification",
                                "description": "Classified hazards, exposure limits and protective measures.",
                                "findings": [
                                    {
                                        "id": "classified-hazards",
                                        "name": "Classified hazards and limits",
                                        "description": "The classification, the scheme it belongs to, and the limits set.",
                                        "questions": [
                                            {
                                                "id": "classified-hazards-q01",
                                                "text": "How is nitrous oxide classified for hazard, under which scheme, and what exposure limits apply?",
                                                "kind": "definition"
                                            },
                                            {
                                                "id": "classified-hazards-q02",
                                                "text": "What protection does handling require, and what must an agent refuse to do without it?",
                                                "kind": "action"
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "regulatory-identity",
                                "name": "Regulatory identity and control",
                                "description": "Registration, restriction and transport rules by jurisdiction.",
                                "findings": [
                                    {
                                        "id": "controls",
                                        "name": "Controls and jurisdiction",
                                        "description": "Where it is restricted and what the restriction attaches to.",
                                        "questions": [
                                            {
                                                "id": "controls-q01",
                                                "text": "Which registrations, restrictions or transport rules cover nitrous oxide, and where?",
                                                "kind": "provenance"
                                            },
                                            {
                                                "id": "controls-q02",
                                                "text": "Does the control attach to the substance, its concentration, or its intended use?",
                                                "kind": "boundary"
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    },
                    {
                        "id": "provenance-and-evidence",
                        "name": "Provenance, evidence and time",
                        "description": "Where every claim about a nitrous oxide came from and when it held.",
                        "rationale": "A claim without a source and a time cannot be superseded, only overwritten, and an agent that overwrites loses the ability to explain itself.",
                        "layers": [
                            {
                                "id": "source-and-authority",
                                "name": "Source and authority",
                                "description": "Who said it, on what evidence, and how strongly.",
                                "findings": [
                                    {
                                        "id": "claim-provenance",
                                        "name": "Claim provenance and confidence",
                                        "description": "The authority behind each claim about a nitrous oxide and how confident it is.",
                                        "questions": [
                                            {
                                                "id": "claim-provenance-q01",
                                                "text": "What identifies and describes a claim about a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "claim-provenance-q02",
                                                "text": "Who or what asserted this about a claim about a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "claim-provenance-q03",
                                                "text": "What may an agent decide or do once a claim about a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            },
                            {
                                "id": "time-and-versions",
                                "name": "Time, versions and supersession",
                                "description": "When a claim was true, when it was learnt, and what replaced it.",
                                "findings": [
                                    {
                                        "id": "validity-and-supersession",
                                        "name": "Validity period and supersession",
                                        "description": "How an old claim about a nitrous oxide is retired without being erased.",
                                        "questions": [
                                            {
                                                "id": "validity-and-supersession-q01",
                                                "text": "What identifies and describes the validity of a claim about a nitrous oxide, and in what units or vocabulary?",
                                                "kind": "definition",
                                                "answer_data": [
                                                    "identifiers",
                                                    "types and classes",
                                                    "values with units",
                                                    "explicit unknowns"
                                                ]
                                            },
                                            {
                                                "id": "validity-and-supersession-q02",
                                                "text": "Who or what asserted this about the validity of a claim about a nitrous oxide, by which method, and when was it true?",
                                                "kind": "provenance",
                                                "answer_data": [
                                                    "authority",
                                                    "method",
                                                    "evidence",
                                                    "event time",
                                                    "knowledge time"
                                                ]
                                            },
                                            {
                                                "id": "validity-and-supersession-q03",
                                                "text": "What may an agent decide or do once the validity of a claim about a nitrous oxide is known, and what must it refuse?",
                                                "kind": "action",
                                                "answer_data": [
                                                    "permitted actions",
                                                    "preconditions",
                                                    "refusals",
                                                    "escalation"
                                                ]
                                            }
                                        ]
                                    }
                                ]
                            }
                        ]
                    }
                ]
            },
            "statistics": {
                "bundles": 9,
                "layers": 19,
                "findings": 21,
                "questions": 57
            }
        }
    }
}