{ "model": { "rank": 6174, "code": "thing-q150681", "model_id": "vr.tr.octane", "name": "octane", "purpose": "Enable an AI agent to identify octane, assess the condition and fitness of an octane sample, and determine which handling or use actions its evidence supports.", "family": "Thing Registry", "category": "Physical world and living systems", "status": "research-draft", "kind": "thing", "plane": "PHY", "domain": "PHY.MAT", "industry": "", "version": "", "url": "/models/thing/q150681/", "tier": 2, "score": 62, "payload": { "layer": "wikidata", "aliases": [], "aliasCount": 0, "merged": 0, "knownIn": 62, "facets": null, "markers": [], "lexicalClass": "", "senseRank": null, "alsoRegisteredAs": "vr.tr.octane", "source": { "dataset": "wikidata", "item": "Q150681", "url": "https://www.wikidata.org/wiki/Q150681", "license": "CC0 1.0" } }, "research": { "vercy": "1.0-draft", "publication": { "status": "research-draft", "adjudicationStatus": "unreviewed", "publishableCanonical": false, "generatedAt": "2026-09-07T11:58:33Z", "providers": [ "Codex", "Grok" ], "missingProviders": [], "pass": 2, "cost": { "grok": { "usd": 0.01230834, "turns": 1, "seconds": 159.2, "error": null }, "codex": { "seconds": 83.7, "error": "Reading additional input from stdin...\nOpenAI Codex v0.153.3\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: 01a07bb8-dfab-79b1-b2fb-d183ec7a9fc2\n--------\nuser\nYou are drafting a Vercy meta-model for one registered thing. Answer as JSON only, no prose around it.\n\nThing: octane\nRegistry id: vr.tr.octane\nPlane / domain: PHY / PHY.MAT\nRegistry definition: (none recorded)\nNames folded into this entry: (none)\n\nA Vercy mod" } } }, "metaModel": { "id": "THING-Q150681", "registryId": "vr.tr.octane", "name": "octane", "version": "0.1.0-research.1", "entryKind": "thing", "family": "Thing Registry", "domain": [ "PHY.MAT" ], "status": "research-draft" }, "canonicalUrl": "https://ver.cy/models/thing/q150681/", "model": { "registry_id": "vr.tr.octane", "name": "octane", "purpose": "Enable an AI agent to identify octane, assess the condition and fitness of an octane sample, and determine which handling or use actions its evidence supports.", "definition": "Octane is any of the eighteen constitutional isomers of the acyclic saturated hydrocarbon C8H18; the unbranched parent hydride is n-octane, while 2,2,4-trimethylpentane (isooctane) is the defined 100-point primary reference fuel for spark-ignition knock rating.", "scope_statement": "For vr.tr.octane, provisionally model the chemical substance n-octane and its identifiable material samples, including octane present as a measured component of a mixture; the registry's intended treatment of other octane isomers remains unresolved. The working identity follows [PubChem's octane record](https://pubchem.ncbi.nlm.nih.gov/compound/356).", "in_scope": [ "Chemical identity and evidence distinguishing n-octane from other substances", "Sample composition, purity, contaminants and analytical confidence", "Physical state and condition-dependent material properties", "Octane-specific handling constraints and exposure observations", "Suitability for a stated solvent, analytical or fuel-component role" ], "out_of_scope": [ "Octane rating as a fuel-performance measurement", "Complete gasoline formulation and finished-fuel certification", "Independent models of branched octane isomers", "Engine design, tuning and combustion-system operation", "Storage equipment design and facility-wide safety management", "Detailed models of reaction products and environmental receiving systems" ], "distinguishing_features": [ "Require molecular connectivity consistent with the unbranched structure CH3(CH2)6CH3; the formula C8H18 alone does not establish this identity. [PubChem](https://pubchem.ncbi.nlm.nih.gov/compound/356)", "Check whether the chemical identifier resolves to n-octane, CAS 111-65-9, while keeping label identification separate from analytical confirmation. [NIOSH](https://www.cdc.gov/niosh/npg/npgd0470.html)", "Use an analytical method demonstrated to distinguish n-octane from branched C8 hydrocarbons; an unresolved hydrocarbon peak is insufficient.", "Distinguish a substance or component concentration from a reported fuel octane rating by checking what was measured and by which method.", "Distinguish a nominally pure sample from an octane-containing fuel or solvent mixture through composition evidence; appearance and odor cannot establish purity." ], "characteristics": [ { "name": "Identity resolution", "kind": "state", "unit_or_values": "unresolved name | label-supported n-octane | analytically supported n-octane | conflicting identity", "why_it_matters": "Prevents properties or permissions being transferred from another isomer or a fuel rating." }, { "name": "Molecular identity", "kind": "category", "unit_or_values": "structure identifier, chemical identifier and resolved preferred name", "why_it_matters": "Connects the material to the specific chemical species rather than merely its molecular formula." }, { "name": "Octane content", "kind": "measurement", "unit_or_values": "mass fraction, mole fraction or mass concentration, with basis, method and uncertainty", "why_it_matters": "Separates an octane sample from a mixture containing octane and supports quantity calculations." }, { "name": "Impurity profile", "kind": "measurement", "unit_or_values": "identified impurity concentrations and unresolved analytical fraction, with reporting limits", "why_it_matters": "Other hydrocarbons, water or residues may affect interpretation and intended use." }, { "name": "Temperature and pressure", "kind": "measurement", "unit_or_values": "°C or K; kPa absolute", "why_it_matters": "Makes phase and volatility observations interpretable." }, { "name": "Observed phase", "kind": "state", "unit_or_values": "liquid | vapor | solid | multiphase | undetermined, at recorded conditions", "why_it_matters": "Determines whether sampling and transfer assumptions match the actual material." }, { "name": "Volatility evidence", "kind": "measurement", "unit_or_values": "vapor pressure in kPa at temperature, or boiling temperature at stated pressure", "why_it_matters": "Supports assessment of evaporation, headspace and material loss." }, { "name": "Airborne octane concentration", "kind": "measurement", "unit_or_values": "ppm by volume or mg/m³, with location, sampling interval and method", "why_it_matters": "Allows an exposure assessment to use measured conditions rather than odor." }, { "name": "Handling disposition", "kind": "state", "unit_or_values": "unassessed | permitted under stated controls | hold for testing | restricted | designated for recovery or disposal", "why_it_matters": "Expresses a conditional action decision with its evidence and limits." }, { "name": "Intended material role", "kind": "relation", "unit_or_values": "sample linked to a solvent task, analytical procedure, blending operation or research process", "why_it_matters": "A sample is acceptable only relative to a particular task and its requirements." } ], "affordances": [ "Resolve an octane label to a chemical identity and flag ambiguous isomer or rating references.", "Request or interpret analyses that establish octane content and distinguish relevant impurities.", "Assess whether measured material conditions support a proposed sampling or transfer operation.", "Accept, restrict or reject a sample for a stated use against documented composition requirements.", "Track octane quantities through dilution, blending, evaporation or recovery with uncertainty.", "Route contaminated or unidentified material to further characterization, recovery or disposal assessment." ] }, "sources": [ { "id": "pubchem-356", "title": "PubChem Compound Summary for CID 356, Octane", "url": "https://pubchem.ncbi.nlm.nih.gov/compound/356", "what_it_supports": "Identity, formula, CAS/EC/InChIKey, physical constants and GHS hazard classification of n-octane.", "url_status": "live" }, { "id": "nist-webbook-n-octane", "title": "NIST Chemistry WebBook: n-Octane", "url": "https://webbook.nist.gov/cgi/cbook.cgi?ID=C111659", "what_it_supports": "Evaluated boiling/melting points, density, vapor pressure and other thermophysical data for n-octane.", "url_status": "live" }, { "id": "niosh-pg-octane", "title": "NIOSH Pocket Guide to Chemical Hazards: Octane", "url": "https://www.cdc.gov/niosh/npg/npgd0471.html", "what_it_supports": "Occupational exposure limits, flammability limits, IDLH and health effects for octane isomers.", "url_status": "live" }, { "id": "un-tdg-1262", "title": "UN Recommendations on the Transport of Dangerous Goods, Model Regulations - UN 1262 OCTANES", "url": "", "what_it_supports": "Transport classification of octane isomer liquids as UN 1262, Class 3 flammable liquid." }, { "id": "astm-d2699", "title": "ASTM D2699 Standard Test Method for Research Octane Number of Spark-Ignition Engine Fuel", "url": "", "what_it_supports": "Defines 2,2,4-trimethylpentane as the 100 reference and n-heptane as the 0 reference for RON." } ], "structure": { "bundles": [ { "id": "octane-identity", "name": "Octane identity", "description": "Resolve what octane denotes in the particular record and how the material's identity is supported.", "rationale": "The unqualified name can be confused with isomers, mixtures and fuel-performance terminology.", "layers": [ { "id": "chemical-referent", "name": "Chemical referent", "description": "Establish the chemical entity intended by the name.", "findings": [ { "id": "resolved-octane-meaning", "name": "Resolved octane meaning", "description": "Record the selected chemical referent without silently broadening the registry entry.", "questions": [ { "text": "Does this occurrence mean unbranched n-octane, an unspecified C8H18 isomer, an isomer mixture or a fuel rating?", "kind": "definition", "id": "resolved-octane-meaning-q01" }, { "text": "Which identifier or structural description supports that interpretation?", "kind": "provenance", "id": "resolved-octane-meaning-q02" } ] } ] }, { "id": "sample-identification", "name": "Sample identification", "description": "Separate a supplier's identity claim from evidence obtained on the sample.", "findings": [ { "id": "identity-evidence", "name": "Identity evidence", "description": "Capture whether the analytical evidence distinguishes the intended octane species from plausible alternatives.", "questions": [ { "text": "Which sample-specific result supports n-octane identity, and what reference material or library comparison was used?", "kind": "provenance", "id": "identity-evidence-q01" }, { "text": "Can the method distinguish relevant branched isomers and co-eluting hydrocarbons?", "kind": "measurement", "id": "identity-evidence-q02" } ] } ] } ] }, { "id": "octane-composition", "name": "Octane composition", "description": "Describe how much octane is present and which other constituents affect interpretation or use.", "rationale": "A chemical name on a container does not establish purity or make mixture properties equal to pure-substance properties.", "layers": [ { "id": "content-and-grade", "name": "Content and grade", "description": "Connect measured octane content to the claimed material grade.", "findings": [ { "id": "octane-assay", "name": "Octane assay", "description": "Record concentration or purity with its measurement basis and limitations.", "questions": [ { "text": "What is the measured n-octane fraction, and is it a mass fraction, mole fraction or uncorrected chromatographic area percentage?", "kind": "measurement", "id": "octane-assay-q01" }, { "text": "Which batch-specific certificate or analysis supports the claimed grade?", "kind": "provenance", "id": "octane-assay-q02" } ] } ] }, { "id": "impurities-and-change", "name": "Impurities and change", "description": "Identify constituents and changes that could invalidate the assay or intended use.", "findings": [ { "id": "composition-integrity", "name": "Composition integrity", "description": "Track relevant contamination and whether the sample still represents the material previously characterized.", "questions": [ { "text": "Which other hydrocarbons, water or nonvolatile residues were measured, and what remains analytically unresolved?", "kind": "measurement", "id": "composition-integrity-q01" }, { "text": "Have evaporation, blending or contamination events made the earlier composition evidence unrepresentative?", "kind": "boundary", "id": "composition-integrity-q02" } ] } ] } ] }, { "id": "phase-and-volatility", "name": "Phase and volatility", "description": "Represent the material's physical condition and its movement between liquid and vapor.", "rationale": "Octane quantity, sampling and handling decisions depend on temperature, pressure and evaporation.", "layers": [ { "id": "conditioned-properties", "name": "Conditioned properties", "description": "Tie phase and physical-property claims to the material and conditions they describe.", "findings": [ { "id": "phase-consistency", "name": "Phase consistency", "description": "Assess whether observations agree with the claimed identity and composition without treating agreement as proof.", "questions": [ { "text": "What phase is observed at the recorded temperature and absolute pressure?", "kind": "measurement", "id": "phase-consistency-q01" }, { "text": "Do density or boiling observations concern this sample, pure n-octane reference data or a mixture?", "kind": "boundary", "id": "phase-consistency-q02" } ] } ] }, { "id": "evaporation-and-partition", "name": "Evaporation and partition", "description": "Capture evidence of octane entering headspace or separating from another phase.", "findings": [ { "id": "octane-distribution", "name": "Octane distribution", "description": "Account for octane outside the sampled liquid when judging representativeness and quantity.", "questions": [ { "text": "What measurements or applicable equilibrium data support the estimated octane content in the headspace?", "kind": "measurement", "id": "octane-distribution-q01" }, { "text": "Could phase separation or evaporation make the sampled portion unrepresentative of the total material?", "kind": "boundary", "id": "octane-distribution-q02" } ] } ] } ] }, { "id": "handling-and-exposure", "name": "Handling and exposure", "description": "Connect octane hazards to actual sample conditions and proposed operations.", "rationale": "Octane is a flammable liquid and is incompatible with strong oxidizers; action decisions need contextual evidence. [NIOSH](https://www.cdc.gov/niosh/npg/npgd0470.html)", "layers": [ { "id": "ignition-and-contact", "name": "Ignition and contact", "description": "Evaluate the proposed operation against vapor generation and chemical compatibility.", "findings": [ { "id": "operation-constraints", "name": "Operation constraints", "description": "Record the conditions and controls needed for a particular octane operation.", "questions": [ { "text": "Which sample-applicable flash-point and flammability evidence informs the operation at its expected temperature?", "kind": "provenance", "id": "operation-constraints-q01" }, { "text": "What ignition, electrostatic and incompatible-contact controls must be verified before the proposed transfer or use?", "kind": "action", "id": "operation-constraints-q02" } ] } ] }, { "id": "exposure-and-release", "name": "Exposure and release", "description": "Represent measured exposure or loss of containment and link it to an applicable response.", "findings": [ { "id": "exposure-disposition", "name": "Exposure disposition", "description": "Keep exposure measurements and release observations distinct from assumptions about acceptable conditions.", "questions": [ { "text": "What airborne octane concentration was measured, over what interval, and with what sampling limitations?", "kind": "measurement", "id": "exposure-disposition-q01" }, { "text": "Which current site procedure and applicable exposure criteria determine whether work may continue or must be restricted?", "kind": "action", "id": "exposure-disposition-q02" } ] } ] } ] }, { "id": "use-and-material-fate", "name": "Use and material fate", "description": "Judge octane against a specific task and track what happens to the material afterward.", "rationale": "Solvent use, analytical use and fuel blending impose different acceptance requirements and do not establish the same performance claims.", "layers": [ { "id": "task-fitness", "name": "Task fitness", "description": "Make suitability conditional on the intended role and available evidence.", "findings": [ { "id": "use-acceptance", "name": "Use acceptance", "description": "Record a supported decision about whether this octane sample meets the task's requirements.", "questions": [ { "text": "What purity, impurity, traceability or physical-condition requirements does the intended task impose?", "kind": "boundary", "id": "use-acceptance-q01" }, { "text": "Does the available evidence support acceptance, restricted use or additional testing for that task?", "kind": "action", "id": "use-acceptance-q02" } ] } ] }, { "id": "quantity-and-transformation", "name": "Quantity and transformation", "description": "Track octane through material operations while linking resulting mixtures or products to their own models.", "findings": [ { "id": "octane-material-balance", "name": "Octane material balance", "description": "Distinguish octane transferred or recovered from octane lost, consumed or left unaccounted for.", "questions": [ { "text": "What octane quantity entered and left the operation, accounting for concentration, vapor losses and measurement uncertainty?", "kind": "measurement", "id": "octane-material-balance-q01" }, { "text": "Does the resulting material remain an octane sample, become a mixture requiring a linked model or contain reaction products requiring separate identification?", "kind": "boundary", "id": "octane-material-balance-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-kinds", "name": "Kinds and varieties", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "n-octane (unbranched C8 alkane)", "2,2,4-trimethylpentane (isooctane), the octane-number 100 primary reference", "other liquid branched C8H18 isomers (methylheptanes, dimethylhexanes, ethylhexanes, trimethylpentanes)", "2,2,3,3-tetramethylbutane, the highly branched isomer that is solid at ambient temperature", "petroleum \"octanes\": mixed C8 paraffin streams from naphtha, alkylate or reformate", "primary-reference-fuel isooctane as specified for RON/MON engines" ], "questions": [ { "id": "evidence-kinds-q01", "text": "Which of these kinds and varieties hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-identifiers", "name": "Identifiers and schemes", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "scheme": "CAS Registry Number", "value_or_pattern": "111-65-9", "note": "n-octane" }, { "scheme": "CAS Registry Number", "value_or_pattern": "540-84-1", "note": "2,2,4-trimethylpentane (isooctane)" }, { "scheme": "EC number (EINECS)", "value_or_pattern": "203-892-1", "note": "n-octane" }, { "scheme": "EC number (EINECS)", "value_or_pattern": "208-759-1", "note": "2,2,4-trimethylpentane" }, { "scheme": "PubChem CID", "value_or_pattern": "356", "note": "n-octane" }, { "scheme": "UN number", "value_or_pattern": "1262", "note": "OCTANES (isomer liquids) in dangerous-goods transport" }, { "scheme": "Molecular formula", "value_or_pattern": "C8H18", "note": "all acyclic octane isomers" }, { "scheme": "InChIKey", "value_or_pattern": "TVMXDCGIABBOFY-UHFFFAOYSA-N", "note": "n-octane" } ], "questions": [ { "id": "evidence-identifiers-q01", "text": "Which of these identifiers and schemes hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-standards-and-regulation", "name": "Standards and regulation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "UN Recommendations on the Transport of Dangerous Goods: UN 1262 OCTANES, Class 3 (UNECE); mirrored in ADR, RID, IMDG and IATA.", "OSHA PEL 500 ppm (2350 mg/m³) 8-hour TWA for octane, all isomers (29 CFR 1910.1000 Table Z-1).", "NIOSH REL 75 ppm TWA and 385 ppm ceiling; IDLH 1000 ppm (NIOSH).", "ACGIH TLV-TWA 300 ppm for octane (ACGIH).", "EU CLP/GHS classification of n-octane as Flam. Liq. 2, Asp. Tox. 1, STOT SE 3 (narcotic), Aquatic Acute 1 / Aquatic Chronic 1 (ECHA).", "REACH registration of n-octane, EC 203-892-1 (ECHA).", "ASTM D2699 and ISO 5164 (Research Octane Number) and ASTM D2700 and ISO 5163 (Motor Octane Number): 2,2,4-trimethylpentane is the 100-point primary reference fuel (ASTM International / ISO)." ], "questions": [ { "id": "evidence-standards-and-regulation-q01", "text": "Which of these standards and regulation hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-real-world-use", "name": "Real-world use", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Constituent of gasoline/naphtha boiling-range streams; n-octane itself is a poor spark-ignition component (very low octane number), while branched C8 paraffins from alkylation (especially isooctane) raise knock resistance.", "Neat 2,2,4-trimethylpentane is the 100 primary reference fuel, blended with n-heptane, in CFR knock-test engines.", "Laboratory and process solvent and GC calibration standard (n-octane).", "UN 1262 cargo in bulk and packaged dangerous-goods shipments of C8 isomer mixtures." ], "questions": [ { "id": "evidence-real-world-use-q01", "text": "Which of these real-world use hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-measurements", "name": "Typical measurements", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "quantity": "normal boiling point", "typical_range": "99.2 (isooctane) to 125.6 (n-octane); 2,2,3,3-tetramethylbutane ~106", "unit": "°C" }, { "quantity": "melting / freezing point", "typical_range": "n-octane about −57; 2,2,3,3-tetramethylbutane about 101 (solid at room temperature)", "unit": "°C" }, { "quantity": "liquid density at ~20 °C", "typical_range": "0.69-0.70", "unit": "g/cm³" }, { "quantity": "closed-cup flash point", "typical_range": "about −12 (isooctane) to 13 (n-octane)", "unit": "°C" }, { "quantity": "lower/upper explosive limit in air", "typical_range": "about 1.0-6.5", "unit": "vol %" }, { "quantity": "vapor pressure at 20 °C", "typical_range": "n-octane ~1.5; isooctane ~5", "unit": "kPa" }, { "quantity": "research octane number (of the neat isomer as a fuel component)", "typical_range": "n-octane about −19; isooctane defined as 100", "unit": "RON points" }, { "quantity": "molar mass", "typical_range": "114.23", "unit": "g/mol" } ], "questions": [ { "id": "evidence-measurements-q01", "text": "Which of these typical measurements hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-failure-modes-and-hazards", "name": "Failure modes and hazards", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "Highly flammable liquid and vapor; flash point near or below ambient, so pool fires and confined-space vapor explosions are the primary process hazard.", "Low electrical conductivity: static discharge during tank filling or pipeline transfer can ignite the vapor.", "Aspiration into the lung after ingestion causes chemical pneumonitis (Aspiration Toxicity 1).", "Inhalation at high concentration causes central-nervous-system depression and narcosis.", "Repeated skin contact defats and irritates skin.", "n-Octane in gasoline blends promotes engine knock; that is a performance failure of the unbranched isomer as an SI fuel, not a safety classification.", "Aquatic toxicity and persistence in spills; vapors are heavier than air and travel to ignition sources." ], "questions": [ { "id": "evidence-failure-modes-and-hazards-q01", "text": "Which of these failure modes and hazards hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-regional-variation", "name": "Regional variation", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ "In US consumer language \"octane\" usually means the anti-knock rating of gasoline (AKI, (R+M)/2), not the C8H18 substance; pump grades 87/89/91-93 AKI.", "In Europe, the UK, Australia and much of the rest of the world the posted rating is RON (typically 91-98+), so the same fuel carries a higher number than the US AKI figure.", "Dangerous-goods shipping names the group \"OCTANES\" (UN 1262), covering isomer mixtures, whereas laboratory catalogues sell named isomers (n-octane, isooctane).", "\"Isooctane\" is petroleum/fuel-chemistry usage for 2,2,4-trimethylpentane, not a systematic IUPAC residual name for all branched octanes." ], "questions": [ { "id": "evidence-regional-variation-q01", "text": "Which of these regional variation hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] }, { "id": "evidence-neighbours", "name": "Neighbouring kinds and how to tell them apart", "description": "Reported by the breadth pass; each item needs checking against its source before it becomes normative.", "evidence": [ { "name": "octane number / octane rating (RON, MON, AKI)", "difference": "A dimensionless knock-resistance rating of a fuel, defined by comparison with isooctane and n-heptane; it is not the chemical C8H18. The substance is identified by formula/CAS; the rating is identified by ASTM D2699/D2700 or ISO 5163/5164." }, { "name": "n-heptane (C7H16) and n-nonane (C9H20)", "difference": "Adjacent linear alkanes; separate by carbon number on GC, boiling point (n-heptane 98.4 °C, n-octane 125.6 °C, n-nonane 150.8 °C) and molecular ion m/z 100 vs 114 vs 128." }, { "name": "octenes (C8H16 alkenes)", "difference": "Unsaturated C8 hydrocarbons; bromine/iodine number or GC-MS (m/z 112) distinguishes them from saturated octane (m/z 114)." }, { "name": "cyclooctane (C8H16)", "difference": "Cyclic saturated C8; formula C8H16 not C8H18, higher density (~0.83 g/cm³) and different GC retention." }, { "name": "2,2,4-trimethylpentane vs n-octane", "difference": "Same formula, different branching: isooctane boils at 99.2 °C and is RON 100; n-octane boils at 125.6 °C and has a large negative RON. Distinguish by boiling point, 13C NMR (quaternary carbons in isooctane) or GC against authentic standards." }, { "name": "gasoline / naphtha", "difference": "Complex C4-C12 mixtures; \"octane\" as a named chemical is a single C8H18 isomer or a UN 1262 C8 cut, confirmed by GC purity, not by a pump octane sticker." } ], "questions": [ { "id": "evidence-neighbours-q01", "text": "Which of these neighbouring kinds and how to tell them apart hold for the sense of octane this model covers, and on what evidence?", "kind": "provenance" } ] } ] } ] } ] }, "openQuestions": [ "Does the registry intend octane to mean n-octane specifically or the broader family of C8H18 isomers?", "Does an existing world model already own this chemical concept and therefore require a registry link instead of a separate publication?", "Which analytical methods and acceptance thresholds are appropriate for the intended octane grades and likely interfering hydrocarbons?", "Which condition-qualified property references should govern pure n-octane assessments, and where are sample measurements required instead?", "Which jurisdictions, sites and intended uses determine the applicable handling, exposure, recovery and disposal requirements?" ], "statistics": { "bundles": 6, "layers": 11, "findings": 18, "questions": 28 } }, "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 octane, record what state it is in, and decide what may be done with it.", "whatItIs": "Enable an AI agent to identify octane, assess the condition and fitness of an octane sample, and determine which handling or use actions its evidence supports.", "characteristics": { "substance": "material", "origin": "natural", "agency": "inert", "mobility": "varies" }, "whatYouCanDoWithIt": [ "observed and measured", "consumed or used up" ], "distinguishingFeatures": [ "Described in 62 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 octane, 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", "use it up, and then need more of it" ], "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": [], "standing": "Described in 62 Wikipedia languages, which measures how widely it is written about rather than how important or how common it is.", "structure": { "bundles": [ { "id": "identity-and-classification", "name": "Identity, naming and classification", "description": "How an agent tells one octane from another, and a octane 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 octane, 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 octane, 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 octane 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 octane, 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 octane, 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 octane 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 octane 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 octane, 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 octane, 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 octane 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 octane from the things most often confused with it.", "questions": [ { "id": "distinguishing-features-q01", "text": "What identifies and describes what distinguishes a octane, 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 octane, 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 octane 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 octane 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 octane, 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 octane, 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 octane 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 octane is built from and which parts are replaceable.", "questions": [ { "id": "parts-and-materials-q01", "text": "What identifies and describes the composition of a octane, 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 octane, 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 octane 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 octane is judged and by whom.", "questions": [ { "id": "condition-assessment-q01", "text": "What identifies and describes the condition of a octane, 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 octane, 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 octane 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 octane 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 octane is, and what that position is measured against.", "questions": [ { "id": "position-and-frame-q01", "text": "What identifies and describes the location of a octane, 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 octane, 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 octane 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 octane 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 octane, 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 octane, 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 octane 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 octane 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 octane between them.", "questions": [ { "id": "stages-and-transitions-q01", "text": "What identifies and describes the lifecycle of a octane, 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 octane, 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 octane 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 octane, how often and by whom.", "findings": [ { "id": "observation-record", "name": "Observation record", "description": "How an observation of a octane 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 octane, 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 octane, 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 octane 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 octane 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 octane is for, and what it is used for anyway.", "findings": [ { "id": "function-and-purpose", "name": "Function, purpose and misuse", "description": "The function a octane performs and the uses that fall outside it.", "questions": [ { "id": "function-and-purpose-q01", "text": "What identifies and describes the use of a octane, 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 octane, 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 octane 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 octane.", "findings": [ { "id": "procedures-and-skills", "name": "Procedures, skills and required tools", "description": "What an agent needs before it can act on a octane at all.", "questions": [ { "id": "procedures-and-skills-q01", "text": "What identifies and describes handling a octane, 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 octane, 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 octane is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] }, { "id": "supply-and-consumption", "name": "Supply and consumption", "description": "Quantities, rates and what running out means.", "findings": [ { "id": "consumption-and-stock", "name": "Consumption, stock and replenishment", "description": "How much of a octane there is and how fast it goes.", "questions": [ { "id": "consumption-and-stock-q01", "text": "What identifies and describes the supply of a octane, and in what units or vocabulary?", "kind": "definition", "answer_data": [ "identifiers", "types and classes", "values with units", "explicit unknowns" ] }, { "id": "consumption-and-stock-q02", "text": "Who or what asserted this about the supply of a octane, by which method, and when was it true?", "kind": "provenance", "answer_data": [ "authority", "method", "evidence", "event time", "knowledge time" ] }, { "id": "consumption-and-stock-q03", "text": "What may an agent decide or do once the supply of a octane 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 octane 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 octane 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 octane 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 octane 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 octane, 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 octane 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 octane 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 octane 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 octane, 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 octane 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 octane and how confident it is.", "questions": [ { "id": "claim-provenance-q01", "text": "What identifies and describes a claim about a octane, 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 octane, 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 octane 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 octane is retired without being erased.", "questions": [ { "id": "validity-and-supersession-q01", "text": "What identifies and describes the validity of a claim about a octane, 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 octane, 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 octane is known, and what must it refuse?", "kind": "action", "answer_data": [ "permitted actions", "preconditions", "refusals", "escalation" ] } ] } ] } ] } ] }, "statistics": { "bundles": 9, "layers": 20, "findings": 22, "questions": 60 } } } }