{
  "vercy": "1.0-draft",
  "publication": {
    "status": "research-draft",
    "adjudicationStatus": "unreviewed",
    "publishableCanonical": false,
    "generatedAt": "2026-09-11T08:17:18Z",
    "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": 1,
    "engine": "claude",
    "enrichment": {
      "pass": 3,
      "engine": "claude",
      "producedAt": "2026-10-05T17:00:00Z",
      "ingestedAt": "2026-10-05T13:24:37+00:00",
      "fields": [
        "agent_conduct",
        "ethics",
        "owners",
        "standards_and_regulation"
      ]
    },
    "gate": {
      "passed": true,
      "version": "1.0",
      "at": "2026-10-06T19:52:02+00:00",
      "evidence": [
        "completeness 1.00",
        "sense: Wikidata description",
        "2 live sources",
        "review by codex: pass"
      ]
    }
  },
  "metaModel": {
    "id": "THING-Q899138",
    "registryId": "vr.tr.mass-fraction",
    "name": "mass fraction",
    "version": "0.2.0-wave.1",
    "entryKind": "thing",
    "family": "Thing Registry",
    "domain": [
      "XCT.REL"
    ],
    "status": "research-draft"
  },
  "canonicalUrl": "https://ver.cy/models/thing/q899138/",
  "model": {
    "registry_id": "vr.tr.mass-fraction",
    "name": "mass fraction",
    "purpose": "Let an agent handle mass fractions by component, mixture, calculation, conversion and uncertainty.",
    "definition": "The ratio of the mass of one component to the total mass of a mixture, w = m_i / m_total, a dimensionless quantity often expressed as a percentage by mass; vapour quality is the mass fraction of vapour in a two-phase mixture.",
    "what_it_is_for": "Describing composition in chemistry, materials, food and engineering.",
    "affordances": [
      "compute mass fractions",
      "convert to mole fraction or concentration",
      "check label compositions",
      "use vapour quality in thermodynamics"
    ],
    "distinguishing_features": [
      "Mass of component over total mass",
      "Dimensionless",
      "Sums to one over all components",
      "Differs from mole and volume fraction"
    ],
    "appearance": "A number between 0 and 1, or a percentage.",
    "visual_identification": [
      "Symbol w",
      "Percent by mass (wt%)",
      "Mole fraction and volume fraction are different"
    ],
    "physical_properties": [
      {
        "quantity": "range",
        "typical_range": "0-1",
        "unit": "dimensionless",
        "note": "or 0-100 percent"
      }
    ],
    "families_and_kinds": [
      "mass fraction of solutes",
      "moisture content",
      "alloy composition",
      "vapour quality"
    ],
    "related_models": [
      {
        "relation": "is a kind of",
        "target": "ratio and chemical quantity",
        "why": "category"
      },
      {
        "relation": "is related to",
        "target": "mole fraction and concentration",
        "why": "quantities"
      },
      {
        "relation": "uses",
        "target": "mass",
        "why": "quantity"
      },
      {
        "relation": "is used in",
        "target": "chemistry and thermodynamics",
        "why": "fields"
      }
    ],
    "identifiers": [
      {
        "scheme": "ISO 80000-9 symbol",
        "value_or_pattern": "w",
        "note": "quantity symbol"
      }
    ],
    "standards_and_regulation": [
      "ISO 80000-9",
      "IUPAC Green Book"
    ],
    "failure_modes_and_hazards": [
      "Confusing mass and mole fraction",
      "Wet versus dry basis errors",
      "Rounding that breaks the sum to one"
    ],
    "in_scope": [],
    "out_of_scope": [],
    "characteristics": [],
    "agent_conduct": {
      "may": [
        "Calculate mass fractions from masses, stating whether results are fractions or percentages.",
        "Convert between mass fraction and other composition measures, stating assumptions."
      ],
      "must_not": [
        "Confuse mass fraction with volume or mole fraction in reported compositions.",
        "Report a concentration on a label or certificate that was not measured.",
        "Round compositions of hazardous or medical mixtures beyond what their use allows."
      ],
      "requires_human": [
        "Relying on calculated compositions for medicines, food or hazardous mixtures."
      ]
    },
    "ethics": {
      "considerations": [
        "Composition errors in medicines and chemicals can harm patients and workers.",
        "Honest labelling of content protects buyers."
      ],
      "affected_parties": [
        "Patients and consumers",
        "Laboratory and plant workers"
      ]
    },
    "owners": {
      "steward": "Nobody: a quantity held in common.",
      "master_systems": []
    }
  },
  "sources": [
    {
      "id": "wikidata",
      "title": "Wikidata item Q899138: mass fraction",
      "url": "https://www.wikidata.org/wiki/Q899138",
      "url_status": "live",
      "what_it_supports": "identity and sense of the item",
      "checked_by": "wikidata-api"
    },
    {
      "id": "wikipedia-en",
      "title": "Wikipedia: Mass fraction (chemistry)",
      "url": "https://en.wikipedia.org/wiki/Mass_fraction_%28chemistry%29",
      "url_status": "live",
      "what_it_supports": "general description of the item",
      "checked_by": "wikidata-api sitelink"
    }
  ],
  "structure": {
    "bundles": [
      {
        "id": "definition",
        "name": "Definition",
        "description": "Which fraction.",
        "rationale": "Definitions matter.",
        "layers": [
          {
            "id": "component",
            "name": "Component",
            "description": "What is measured.",
            "findings": [
              {
                "id": "component-finding",
                "name": "Component",
                "description": "Component.",
                "questions": [
                  {
                    "text": "Which component and which mixture?",
                    "kind": "definition"
                  },
                  {
                    "text": "Is it on a wet or dry basis?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "value",
            "name": "Value",
            "description": "Result.",
            "findings": [
              {
                "id": "value-finding",
                "name": "Value",
                "description": "Value.",
                "questions": [
                  {
                    "text": "What is the mass fraction?",
                    "kind": "measurement"
                  },
                  {
                    "text": "How was it measured?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "conversion",
        "name": "Conversion",
        "description": "Other measures.",
        "rationale": "Conversions need data.",
        "layers": [
          {
            "id": "mole",
            "name": "Mole fraction",
            "description": "Conversion.",
            "findings": [
              {
                "id": "mole-finding",
                "name": "Mole",
                "description": "Mole fraction.",
                "questions": [
                  {
                    "text": "What is the equivalent mole fraction?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which molar masses were used?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "concentration",
            "name": "Concentration",
            "description": "Mass per volume.",
            "findings": [
              {
                "id": "concentration-finding",
                "name": "Concentration",
                "description": "Concentration.",
                "questions": [
                  {
                    "text": "What concentration does it correspond to?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which density was used?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "uncertainty",
        "name": "Uncertainty",
        "description": "Precision.",
        "rationale": "Uncertainty matters.",
        "layers": [
          {
            "id": "precision",
            "name": "Precision",
            "description": "Measurement.",
            "findings": [
              {
                "id": "precision-finding",
                "name": "Precision",
                "description": "Precision.",
                "questions": [
                  {
                    "text": "How uncertain is the value?",
                    "kind": "measurement"
                  },
                  {
                    "text": "Which method?",
                    "kind": "provenance"
                  }
                ]
              }
            ]
          },
          {
            "id": "sums",
            "name": "Sums",
            "description": "Consistency.",
            "findings": [
              {
                "id": "sums-finding",
                "name": "Sums",
                "description": "Consistency.",
                "questions": [
                  {
                    "text": "Do component fractions sum to one?",
                    "kind": "boundary"
                  },
                  {
                    "text": "How is rounding handled?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          }
        ]
      },
      {
        "id": "applications",
        "name": "Applications",
        "description": "Uses.",
        "rationale": "Mass fraction is widely used.",
        "layers": [
          {
            "id": "labels",
            "name": "Labels",
            "description": "Product composition.",
            "findings": [
              {
                "id": "labels-finding",
                "name": "Labels",
                "description": "Composition labels.",
                "questions": [
                  {
                    "text": "Is the label composition by mass?",
                    "kind": "definition"
                  },
                  {
                    "text": "Does it meet labelling rules?",
                    "kind": "boundary"
                  }
                ]
              }
            ]
          },
          {
            "id": "thermo",
            "name": "Thermodynamics",
            "description": "Vapour quality.",
            "findings": [
              {
                "id": "thermo-finding",
                "name": "Thermo",
                "description": "Vapour quality.",
                "questions": [
                  {
                    "text": "What vapour quality applies in the two-phase region?",
                    "kind": "measurement"
                  },
                  {
                    "text": "How is it computed?",
                    "kind": "definition"
                  }
                ]
              }
            ]
          }
        ]
      }
    ]
  },
  "openQuestions": [
    "Should composition quantities be separate entries?",
    "How should conversions be recorded?",
    "How should vapour quality be linked?"
  ],
  "statistics": {
    "bundles": 4,
    "layers": 8,
    "findings": 8,
    "questions": 16
  }
}