{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.mass-fraction","code":"thing-q899138","url":"https://ver.cy/models/thing/q899138/","name":"mass fraction","alternateNames":["mass fraction of water","vapor quality"],"kind":"thing","status":"published","version":"0.2.0-wave.1","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.REL"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"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.","purpose":"Let an agent handle mass fractions by component, mixture, calculation, conversion and uncertainty.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Mass of component over total mass","Dimensionless","Sums to one over all components","Differs from mole and volume fraction"],"structure":{"bundles":[{"id":"definition","name":"Definition","description":"Which fraction.","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.","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.","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.","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"}]}]}]}]},"agentConduct":{"may":["Calculate mass fractions from masses, stating whether results are fractions or percentages.","Convert between mass fraction and other composition measures, stating assumptions."],"mustNot":["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."],"requiresHuman":["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."],"affectedParties":["Patients and consumers","Laboratory and plant workers"]},"owners":{"steward":"Nobody: a quantity held in common.","roles":[],"masterSystems":[]},"relations":[{"target":"Q137974504","type":"parent","note":"registry parent class"},{"target":"Q17547084","type":"parent","note":"registry parent class"},{"target":"Q71550700","type":"parent","note":"registry parent class"},{"target":"ratio and chemical quantity","type":"related","note":"category"},{"target":"mole fraction and concentration","type":"related","note":"quantities"},{"target":"mass","type":"related","note":"quantity"},{"target":"chemistry and thermodynamics","type":"related","note":"fields"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.mass-fraction","Wikidata: Q899138 (https://www.wikidata.org/wiki/Q899138)","ISO 80000-9 symbol: w quantity symbol"]},"properties":{"applicability":"not-applicable","items":["range: 0-1 dimensionless - or 0-100 percent"]},"recognition":{"applicability":"optional","items":["Symbol w","Percent by mass (wt%)","Mole fraction and volume fraction are different","A number between 0 and 1, or a percentage."]},"capabilities":{"applicability":"required","items":["compute mass fractions","convert to mole fraction or concentration","check label compositions","use vapour quality in thermodynamics"]},"hazards":{"applicability":"required","items":["Confusing mass and mole fraction","Wet versus dry basis errors","Rounding that breaks the sum to one"]},"interfaces":{"applicability":"required","items":["ISO 80000-9","IUPAC Green Book"]},"context":{"applicability":"required","items":["Describing composition in chemistry, materials, food and engineering.","mass fraction of solutes","moisture content","alloy composition","vapour quality"]}},"sources":[{"title":"Wikidata item Q899138: mass fraction","url":"https://www.wikidata.org/wiki/Q899138","note":"identity and sense of the item"},{"title":"Wikipedia: Mass fraction (chemistry)","url":"https://en.wikipedia.org/wiki/Mass_fraction_%28chemistry%29","note":"general description of the item"}],"openQuestions":["Should composition quantities be separate entries?","How should conversions be recorded?","How should vapour quality be linked?"],"resources":{"spec":"/models/things/publications/thing-q899138/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q899138/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T08:17:18Z","builder":"tools/build_cards.py@1.0.0"},"completeness":{"sections":{"classifiers":"filled","whatItIs":"filled","purpose":"filled","distinguishingFeatures":"filled","structure":"filled","agentConduct":"filled","ethics":"filled","owners":"filled","relations":"filled","interaction.identity":"filled","interaction.properties":"not-applicable","interaction.recognition":"filled","interaction.capabilities":"filled","interaction.hazards":"filled","interaction.interfaces":"filled","interaction.context":"filled","sources":"filled"},"notes":{"_gate":"Published through the thing publication gate 1.0 on 2026-10-06T19:52:02+00:00: completeness 1.00; sense: Wikidata description; 2 live sources; review by codex: pass","interaction.properties":"Plane XCT: no invented physical properties."},"score":1.0}}