{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.intensive-quantity","code":"thing-q3387041","url":"https://ver.cy/models/thing/q3387041/","name":"intensive quantity","alternateNames":["specific power","volumic data density","areal data density","climatic water deficit","Specific potential energy","molar heat capacity","molar entropy","specific entropy","areal energy density","molar heat capacity at constant pressure","molar heat capacity at constant volume","quantity per solid angle"],"kind":"thing","status":"published","version":"0.2.0-wave.2","language":"en","classifiers":{"family":"Thing Registry","category":"Cross-cutting context","entryKind":"thing","plane":"XCT","domain":["XCT.QLT"],"industry":[],"navPath":"","tags":[],"facets":{}},"whatItIs":"A physical quantity whose value does not depend on the size or amount of the system, such as temperature, pressure, density, specific heat capacity, molar heat capacity, specific power and areal or volumic data density, in contrast with extensive quantities such as mass, volume and energy that scale with system size; intensive quantities are often ratios of two extensive quantities.","purpose":"Let an agent classify quantities as intensive or extensive, explain why the distinction matters, derive intensive quantities from extensive ones, and handle borderline cases.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Size-independent","Ratio-derived often","Thermodynamic role","Contrast with extensive"],"structure":{"bundles":[{"id":"classify","name":"Classify","description":"Intensive or extensive.","layers":[{"id":"test","name":"Test","description":"Classifying a quantity.","findings":[{"id":"test-finding","name":"Test","description":"Classification.","questions":[{"text":"Is this quantity intensive or extensive, and how can that be tested by imagining the system doubled?","kind":"definition"},{"text":"Which quantities are neither, such as some non-additive cases?","kind":"boundary"}]}]},{"id":"examples","name":"Examples","description":"Common examples.","findings":[{"id":"examples-finding","name":"Examples","description":"Examples.","questions":[{"text":"Which common quantities are intensive, from temperature and pressure to specific power and data density?","kind":"definition"},{"text":"What are climatic water deficit and similar indices?","kind":"definition"}]}]}]},{"id":"derive","name":"Derive","description":"Building intensive quantities.","layers":[{"id":"ratios","name":"Ratios","description":"Specific and molar quantities.","findings":[{"id":"ratios-finding","name":"Ratios","description":"Ratios.","questions":[{"text":"How are specific, molar, areal and volumic quantities derived from extensive ones?","kind":"definition"},{"text":"How are they named and written under IUPAC and SI conventions?","kind":"provenance"}]}]},{"id":"combine","name":"Combine","description":"Combining systems.","findings":[{"id":"combine-finding","name":"Combine","description":"Combining.","questions":[{"text":"How do intensive quantities behave when systems are combined, and when can they be averaged?","kind":"definition"},{"text":"How is a weighted average used?","kind":"action"}]}]}]},{"id":"use","name":"Use","description":"Why it matters.","layers":[{"id":"thermo","name":"Thermo","description":"Thermodynamics.","findings":[{"id":"thermo-finding","name":"Thermo","description":"Thermodynamics.","questions":[{"text":"Why does the intensive-extensive distinction matter in thermodynamics, such as for equilibrium and state functions?","kind":"definition"},{"text":"How does it appear in the Gibbs-Duhem relation?","kind":"definition"}]}]},{"id":"engineering","name":"Engineering","description":"Engineering and data.","findings":[{"id":"engineering-finding","name":"Engineering","description":"Engineering.","questions":[{"text":"How are intensive quantities used to compare materials, devices and storage media, such as specific power or areal density?","kind":"action"},{"text":"Which pitfalls arise in comparisons?","kind":"boundary"}]}]}]},{"id":"learn","name":"Learn","description":"Teaching.","layers":[{"id":"teach","name":"Teach","description":"Teaching the distinction.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How can intensive and extensive quantities be taught with examples?","kind":"action"},{"text":"Which misconceptions arise?","kind":"provenance"}]}]},{"id":"history","name":"History","description":"History.","findings":[{"id":"history-finding","name":"History","description":"History.","questions":[{"text":"Who introduced the terms intensive and extensive, and how has usage evolved?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]}]}]},"agentConduct":{"may":["Classify quantities as intensive or extensive and convert between specific and molar forms.","Report measured intensive quantities with units and conditions."],"mustNot":["Add or average intensive quantities as if they were extensive.","Confuse specific, molar and volumetric quantities in calculations.","Report a temperature or pressure without its units and reference conditions."],"requiresHuman":["Using calculated values in safety-critical design or process control."]},"ethics":{"considerations":["Calculation errors with these quantities can cause unsafe process conditions.","Honest units and conditions keep science reproducible."],"affectedParties":["Engineers and scientists","Students","Process operators"]},"owners":{"steward":"Nobody: a physical concept held in common.","roles":[],"masterSystems":[]},"relations":[{"target":"Q107715","type":"parent","note":"registry parent class"},{"target":"physical quantity","type":"related","note":"category"},{"target":"extensive quantity","type":"related","note":"contrast"},{"target":"capacity","type":"related","note":"an extensive counterpart"},{"target":"chemical property","type":"related","note":"many are intensive"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.intensive-quantity","Wikidata: Q3387041 (https://www.wikidata.org/wiki/Q3387041)"]},"properties":{"applicability":"not-applicable","items":[]},"recognition":{"applicability":"optional","items":["Independent of system size","Often a ratio of extensives","Extensive quantities add when systems combine","Not physical; a property of quantities."]},"capabilities":{"applicability":"required","items":["classify a quantity as intensive or extensive","explain the distinction and its uses","derive specific and molar quantities","handle borderline cases"]},"hazards":{"applicability":"required","items":["Adding intensive quantities incorrectly","Confusing specific and molar quantities","Misclassifying borderline quantities"]},"interfaces":{"applicability":"required","items":["SI and metrology conventions on quantities","IUPAC recommendations on specific and molar quantities"]},"context":{"applicability":"required","items":["Classifying physical quantities by scaling.","thermodynamic intensive quantities such as temperature and pressure","specific quantities per mass","molar quantities per amount","densities per volume or area","derived intensive indices such as climatic water deficit"]}},"sources":[{"title":"Wikidata item Q3387041: intensive quantity","url":"https://www.wikidata.org/wiki/Q3387041","note":"identity and sense of the item"},{"title":"Wikipedia: Intensive quantity","url":"https://en.wikipedia.org/wiki/Intensive_quantity","note":"general description of the item"}],"openQuestions":["Should extensive quantities be a separate entry?","How should metrology references be linked?","How should borderline cases be documented?"],"resources":{"spec":"/models/things/publications/thing-q3387041/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q3387041/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-11T21:39:37Z","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 2026-10-06T19:51:59+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}}