{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.amount-of-substance-fraction","code":"thing-q125264","url":"https://ver.cy/models/thing/q125264/","name":"amount-of-substance fraction","alternateNames":[],"kind":"thing","status":"research-draft","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 amount of substance of a component to the total amount of substance in a mixture, also called mole fraction, a dimensionless quantity between 0 and 1 often expressed as a percentage or in parts per million, used in chemistry, atmospheric science and isotope abundance.","purpose":"Let an agent compute and convert amount-of-substance fractions, relate them to mass fractions and concentrations, and apply them in chemistry and atmospheric measurements.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Dimensionless ratio","Based on amount of substance","Sums to 1 across components","Independent of temperature"],"structure":{"bundles":[{"id":"compute","name":"Compute","description":"Calculation.","layers":[{"id":"from","name":"From","description":"From amounts.","findings":[{"id":"from-finding","name":"From","description":"From amounts.","questions":[{"text":"What is the mole fraction of each component given amounts or masses and molar masses?","kind":"measurement"},{"text":"Do the fractions sum to one?","kind":"boundary"}]}]},{"id":"convert","name":"Convert","description":"To other measures.","findings":[{"id":"convert-finding","name":"Convert","description":"Conversion.","questions":[{"text":"How does this mole fraction convert to mass fraction, molality or molar concentration?","kind":"measurement"},{"text":"Which extra data are needed?","kind":"definition"}]}]}]},{"id":"apply","name":"Apply","description":"Applications.","layers":[{"id":"gases","name":"Gases","description":"Gas mixtures.","findings":[{"id":"gases-finding","name":"Gases","description":"Gas mixtures.","questions":[{"text":"How does mole fraction relate to partial pressure in a gas mixture?","kind":"definition"},{"text":"What is the mole fraction of carbon dioxide in air, according to current measurements?","kind":"provenance"}]}]},{"id":"solutions","name":"Solutions","description":"Colligative properties.","findings":[{"id":"solutions-finding","name":"Solutions","description":"Solutions.","questions":[{"text":"How does mole fraction enter Raoult law and colligative properties?","kind":"definition"},{"text":"When is it preferred over molarity?","kind":"boundary"}]}]}]},{"id":"units","name":"Units","description":"Expression.","layers":[{"id":"ppm","name":"Ppm","description":"Parts per million.","findings":[{"id":"ppm-finding","name":"Ppm","description":"Parts per million.","questions":[{"text":"Is this ppm value on a mole or mass basis?","kind":"boundary"},{"text":"How is it stated unambiguously?","kind":"action"}]}]},{"id":"notation","name":"Notation","description":"Symbols.","findings":[{"id":"notation-finding","name":"Notation","description":"Notation.","questions":[{"text":"Which symbols and names does IUPAC recommend?","kind":"provenance"},{"text":"Is amount fraction or mole fraction preferred?","kind":"provenance"}]}]}]},{"id":"isotopes","name":"Isotopes","description":"Abundance.","layers":[{"id":"abundance","name":"Abundance","description":"Isotopic abundance.","findings":[{"id":"abundance-finding","name":"Abundance","description":"Isotopic abundance.","questions":[{"text":"What is the amount fraction of this isotope in natural samples?","kind":"provenance"},{"text":"How does it vary between sources?","kind":"provenance"}]}]},{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"Which worked examples clarify mole fraction?","kind":"action"},{"text":"Which errors are common?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Compute and report mole fractions with stated components and units.","Convert between mole fraction, mass fraction and parts per million with stated assumptions."],"mustNot":["Confuse mole fraction with mass or volume fraction in safety-relevant output.","Report gas concentrations in units that hide exceedances of safety limits.","Invent composition data for a mixture."],"requiresHuman":["Declaring an atmosphere or mixture safe from concentration figures."]},"ethics":{"considerations":["Concentration figures decide whether air and products are safe.","Misreported greenhouse gas fractions mislead public debate."],"affectedParties":["Workers in enclosed spaces","The public","Students and researchers"]},"owners":{"steward":"Nobody owns the quantity; international metrology bodies define it.","roles":[],"masterSystems":[]},"relations":[{"target":"Q137974504","type":"parent","note":"registry parent class"},{"target":"Q17547084","type":"parent","note":"registry parent class"},{"target":"ratio of two quantities of the same kind","type":"related","note":"category"},{"target":"abundance","type":"related","note":"category"},{"target":"fineness","type":"related","note":"a mass fraction"},{"target":"mass number","type":"related","note":"isotope context"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.amount-of-substance-fraction","Wikidata: Q125264 (https://www.wikidata.org/wiki/Q125264)"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Symbol x for liquids and y for gases","Values from 0 to 1 or in ppm","Mass fraction uses masses instead","Not physical; a dimensionless number."]},"capabilities":{"applicability":"required","items":["compute mole fractions from amounts or masses","convert between mole, mass and volume fractions","apply in gas mixtures and solutions","express isotope abundance"]},"hazards":{"applicability":"required","items":["Confusing mole and mass fractions","Ppm ambiguity between mole and mass basis","Rounding so fractions do not sum to one"]},"interfaces":{"applicability":"required","items":["ISO 80000-9 quantities in chemistry","IUPAC Green Book"]},"context":{"applicability":"required","items":["Expressing composition of mixtures.","mole fraction in liquids","mole fraction in gases","isotope abundance fractions","trace fractions in ppm and ppb"]}},"sources":[],"openQuestions":["Should mass fraction be a separate entry?","How should composition data be linked?","How should ppm conventions be recorded?"],"resources":{"spec":"/models/things/publications/thing-q125264/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q125264/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T15:32:53Z","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":"missing"},"notes":{"interaction.properties":"Plane XCT: no invented physical properties.","sources":"Written from model knowledge without web access; claims are unverified."},"score":0.938}}