{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-12T22:59:37Z",
    "providers": [
      "Claude"
    ],
    "breadth": "written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify",
    "pass": 2,
    "wave": 3,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-06T10:00:00Z",
      "ingestedAt": "2026-10-06T06:59:34+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:51:59+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q40936",
    "registryId": "vr.tr.ph",
    "name": "pH",
    "version": "0.2.0-wave.3",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "XCT.QLT"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q40936/",
  "model": {
    "registry_id": "vr.tr.ph",
    "name": "pH",
    "purpose": "Let an agent explain pH and its definition, relay measurement methods and standards, describe typical values and their significance in domains such as blood, soil and paper, and route personal health questions to clinicians.",
    "definition": "A logarithmic measure of the acidity or alkalinity of an aqueous solution, defined as the negative decimal logarithm of the hydrogen ion activity, with 7 neutral at 25 degrees Celsius, lower values acidic and higher values alkaline; pH is measured with electrodes or indicators, is central to chemistry, biology, medicine, agriculture and industry, and specific values such as blood pH, urine pH, soil pH and the pH of paper are monitored for health, growth and preservation.",
    "what_it_is_for": "Quantifying acidity and alkalinity.",
    "affordances": [
      "explain the definition and scale",
      "relay measurement methods",
      "relay typical values by domain",
      "route personal health questions"
    ],
    "distinguishing_features": [
      "Logarithmic",
      "Temperature dependent",
      "Measured by electrode or indicator",
      "Domain-specific reference ranges"
    ],
    "appearance": "Not a visible object; a number on a meter or a colour on indicator paper.",
    "visual_identification": [
      "Negative log of hydrogen ion activity",
      "Scale around 0 to 14 in water",
      "Acidity in food labelling and total acidity are related but different measures"
    ],
    "physical_properties": [
      {
        "quantity": "neutral pH at 25 degrees C",
        "typical_range": "7.0",
        "unit": "pH",
        "note": ""
      },
      {
        "quantity": "normal arterial blood pH",
        "typical_range": "7.35-7.45",
        "unit": "pH",
        "note": ""
      },
      {
        "quantity": "circumneutral range",
        "typical_range": "about 6.5-7.5",
        "unit": "pH",
        "note": "in ecology"
      }
    ],
    "families_and_kinds": [
      "pH of solutions in chemistry",
      "blood and urine pH in medicine",
      "soil pH in agriculture",
      "pH of natural waters",
      "pH of paper and materials in conservation",
      "pH scales in non-aqueous systems"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "logarithmic quantity",
        "why": "in registry terms"
      },
      {
        "relation": "is a kind of",
        "target": "chemical quantity",
        "why": "in registry terms"
      },
      {
        "relation": "measures",
        "target": "acidity",
        "why": "and alkalinity"
      },
      {
        "relation": "is measured by",
        "target": "pH meter",
        "why": "the instrument"
      }
    ],
    "identifiers": [
      {
        "scheme": "IUPAC definition",
        "value_or_pattern": "pH",
        "note": "based on hydrogen ion activity"
      }
    ],
    "standards_and_regulation": [
      "IUPAC recommendations on pH",
      "ISO and national standards for pH measurement and buffers",
      "Drinking water and environmental pH limits",
      "Clinical reference ranges"
    ],
    "failure_modes_and_hazards": [
      "Calibration and temperature errors",
      "Misreading the logarithmic scale",
      "Agents interpreting personal test results"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Explain the pH scale and measure pH with calibrated instruments it is authorized to use.",
        "Report pH readings with temperature, method and calibration date."
      ],
      "must_not": [
        "Report a reading from an uncalibrated or failed probe as valid.",
        "Advise a person to treat their own blood or urine pH as a diagnosis.",
        "Adjust the pH of drinking water, pools or process streams beyond authorized limits.",
        "Mix strong acids or alkalis to change pH without the handling controls the work requires."
      ],
      "requires_human": [
        "Changing dosing in water treatment or other systems people rely on."
      ]
    },
    "ethics": {
      "considerations": [
        "pH errors in water treatment or pools can injure people.",
        "Health products that promise to change body pH mislead buyers."
      ],
      "affected_parties": [
        "Users of treated water",
        "Patients",
        "Workers handling chemicals"
      ]
    },
    "owners": {
      "steward": "Nobody owns the measure; operators answer for the readings and processes they control.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q40936: pH",
      "url": "https://www.wikidata.org/wiki/Q40936",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: PH",
      "url": "https://en.wikipedia.org/wiki/PH",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "define",
        "name": "Define",
        "description": "What pH is.",
        "rationale": "Definition.",
        "layers": [
          {
            "id": "definition",
            "name": "Definition",
            "description": "Definition and scale.",
            "findings": [
              {
                "id": "definition-finding",
                "name": "Definition",
                "description": "Definition.",
                "questions": [
                  {
                    "text": "What is pH, how is it defined, and why is the scale logarithmic?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is the question about pH or about a related acidity measure?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "chemistry",
            "name": "Chemistry",
            "description": "Chemistry of pH.",
            "findings": [
              {
                "id": "chemistry-finding",
                "name": "Chemistry",
                "description": "Chemistry.",
                "questions": [
                  {
                    "text": "How do acids, bases and buffers determine pH, and how does temperature affect it?",
                    "kind": "definition"
                  },
                  {
                    "text": "Which entry fits acid-base chemistry?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "measure",
        "name": "Measure",
        "description": "Measurement.",
        "rationale": "Computation.",
        "layers": [
          {
            "id": "methods",
            "name": "Methods",
            "description": "Methods.",
            "findings": [
              {
                "id": "methods-finding",
                "name": "Methods",
                "description": "Methods.",
                "questions": [
                  {
                    "text": "How is pH measured with electrodes and indicators, and how are meters calibrated?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which references are standard?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "compute",
            "name": "Compute",
            "description": "Calculation.",
            "findings": [
              {
                "id": "compute-finding",
                "name": "Compute",
                "description": "Compute.",
                "questions": [
                  {
                    "text": "How is pH calculated from concentrations, and how are values converted?",
                    "kind": "action"
                  },
                  {
                    "text": "What is the result for the values in question?",
                    "kind": "measurement"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "domains",
        "name": "Domains",
        "description": "pH by domain.",
        "rationale": "Application.",
        "layers": [
          {
            "id": "health",
            "name": "Health",
            "description": "Blood and urine pH.",
            "findings": [
              {
                "id": "health-finding",
                "name": "Health",
                "description": "Health.",
                "questions": [
                  {
                    "text": "What are normal blood and urine pH ranges, and what do deviations indicate, in general terms?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Is the user asking about their own test results, which need a clinician?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "environment",
            "name": "Environment",
            "description": "Soil, water and materials.",
            "findings": [
              {
                "id": "environment-finding",
                "name": "Environment",
                "description": "Environment.",
                "questions": [
                  {
                    "text": "How is pH used in soil management, water quality and paper conservation?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits soil pH?",
                    "kind": "action"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "context",
        "name": "Context",
        "description": "History and teaching.",
        "rationale": "Context.",
        "layers": [
          {
            "id": "history",
            "name": "History",
            "description": "History.",
            "findings": [
              {
                "id": "history-finding",
                "name": "History",
                "description": "History.",
                "questions": [
                  {
                    "text": "How was pH introduced by Sorensen in 1909, and how has its definition changed?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which entry fits the history of chemistry?",
                    "kind": "action"
                  }
                ]
              }
            ]
          },
          {
            "id": "teach",
            "name": "Teach",
            "description": "Teaching.",
            "findings": [
              {
                "id": "teach-finding",
                "name": "Teach",
                "description": "Teaching.",
                "questions": [
                  {
                    "text": "How is pH taught, and which misconceptions arise?",
                    "kind": "provenance"
                  },
                  {
                    "text": "Which sources are cited?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should blood pH and soil pH be separate entries?",
    "How should measurement standards be linked?",
    "The registry entry has merged aliases naming domain-specific values; should they be split off?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}