{"schema":"https://ver.cy/schemas/card/1.0.0","id":"vr.tr.mass-ratio","code":"thing-q1563068","url":"https://ver.cy/models/thing/q1563068/","name":"mass ratio","alternateNames":[],"kind":"thing","status":"published","version":"0.2.0-wave.3","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 two masses expressed as a dimensionless number, used in several fields with specific meanings: in rocketry the ratio of a vehicle initial mass to its final mass after burning propellant, which sets the achievable velocity change through the rocket equation; in chemistry and physics the ratio of the masses of two particles, isotopes or components; and in engineering the ratio of payload or structure to total mass.","purpose":"Let an agent identify which mass ratio is meant, explain its definition and use in that field, relay typical values and the relations that use it, and keep the senses separate.","scope":{"in":[],"out":[],"boundaries":[]},"distinguishingFeatures":["Dimensionless","Sense depends on field","In rocketry tied to the rocket equation","In physics a fundamental constant in some cases"],"structure":{"bundles":[{"id":"sense","name":"Sense","description":"Which mass ratio.","layers":[{"id":"which","name":"Which","description":"Sense in context.","findings":[{"id":"which-finding","name":"Which","description":"Which.","questions":[{"text":"Which mass ratio is meant, and what are its numerator and denominator?","kind":"definition"},{"text":"Is the question about a ratio or about a mass fraction or a specific quantity?","kind":"boundary"}]}]},{"id":"definition","name":"Definition","description":"Definition per field.","findings":[{"id":"definition-finding","name":"Definition","description":"Definition.","questions":[{"text":"How is the ratio defined in rocketry, physics and engineering?","kind":"definition"},{"text":"Which entry fits the field?","kind":"action"}]}]}]},{"id":"rocketry","name":"Rocketry","description":"The rocket equation.","layers":[{"id":"equation","name":"Equation","description":"Rocket equation.","findings":[{"id":"equation-finding","name":"Equation","description":"Equation.","questions":[{"text":"How does the mass ratio determine velocity change through the rocket equation?","kind":"definition"},{"text":"Which entry fits the rocket equation?","kind":"action"}]}]},{"id":"values","name":"Values","description":"Typical values.","findings":[{"id":"values-finding","name":"Values","description":"Values.","questions":[{"text":"What mass ratios do stages and vehicles achieve, with sources?","kind":"measurement"},{"text":"Which conditions are stated?","kind":"boundary"}]}]}]},{"id":"physics","name":"Physics","description":"Particle and chemical ratios.","layers":[{"id":"constants","name":"Constants","description":"Fundamental ratios.","findings":[{"id":"constants-finding","name":"Constants","description":"Constants.","questions":[{"text":"What are the values of key particle mass ratios, and where are they published?","kind":"measurement"},{"text":"Which CODATA release is cited?","kind":"provenance"}]}]},{"id":"chemistry","name":"Chemistry","description":"Isotope and molecular ratios.","findings":[{"id":"chemistry-finding","name":"Chemistry","description":"Chemistry.","questions":[{"text":"How are isotope and molecular mass ratios used in analysis?","kind":"provenance"},{"text":"Which entry fits mass spectrometry?","kind":"action"}]}]}]},{"id":"learn","name":"Learn","description":"Teaching.","layers":[{"id":"teach","name":"Teach","description":"Teaching.","findings":[{"id":"teach-finding","name":"Teach","description":"Teaching.","questions":[{"text":"How is mass ratio taught, and which misconceptions arise?","kind":"provenance"},{"text":"Which references are standard?","kind":"provenance"}]}]},{"id":"compute","name":"Compute","description":"Computation.","findings":[{"id":"compute-finding","name":"Compute","description":"Compute.","questions":[{"text":"How is a mass ratio computed and reported with uncertainty?","kind":"action"},{"text":"Which entry fits measurement uncertainty?","kind":"action"}]}]}]}]},"agentConduct":{"may":["Calculate and explain a mass ratio in the sense of the field asked about.","State which mass ratio is meant, such as rocket or binary star."],"mustNot":["Mix up the definitions of mass ratio used in different fields.","Present rocket performance figures as guidance for building weapons.","Quote a mass ratio without stating which masses it compares."],"requiresHuman":["Using mass ratio figures in a design that affects safety."]},"ethics":{"considerations":["Confusing definitions leads to wrong results in engineering.","Rocketry knowledge has both civil and military uses."],"affectedParties":["Students","Engineers"]},"owners":{"steward":"Nobody owns the concept; it belongs to physics and engineering.","roles":[],"masterSystems":[]},"relations":[{"target":"Q107715","type":"parent","note":"registry parent class"},{"target":"Q137974504","type":"parent","note":"registry parent class"},{"target":"Q25389752","type":"parent","note":"registry parent class"},{"target":"Q71550700","type":"parent","note":"registry parent class"},{"target":"ratio of two quantities of the same kind","type":"related","note":"a dimensionless quantity"},{"target":"Tsiolkovsky rocket equation","type":"related","note":"rocketry sense"},{"target":"mass fraction","type":"related","note":"a related measure"},{"target":"proton-to-electron mass ratio","type":"related","note":"a fundamental constant"}],"interaction":{"identity":{"applicability":"required","items":["Vercy registry: vr.tr.mass-ratio","Wikidata: Q1563068 (https://www.wikidata.org/wiki/Q1563068)"]},"properties":{"applicability":"not-applicable","items":["rocket stage mass ratio: about 3-20 ratio - by stage and propellant","proton to electron mass ratio: about 1836.15 ratio - CODATA"]},"recognition":{"applicability":"optional","items":["Ratio of two masses, dimensionless","In rocketry, initial over final mass","Mass fraction and specific quantities per mass are related but different","Not visible; a pure number."]},"capabilities":{"applicability":"required","items":["identify the sense in context","compute the ratio from given masses","apply the rocket equation or other relations","relay typical values with sources"]},"hazards":{"applicability":"required","items":["Mixing senses across fields","Inverting the ratio","Unstated conditions for rocket values"]},"interfaces":{"applicability":"required","items":["ISO 80000 conventions for dimensionless quantities","CODATA values for particle mass ratios"]},"context":{"applicability":"required","items":["Comparing masses in a dimensionless way.","rocket mass ratio","particle mass ratios such as proton to electron","isotope and molecular mass ratios","payload and structural mass ratios in engineering","mass ratios in ecology and biology"]}},"sources":[{"title":"Wikidata item Q1563068: mass ratio","url":"https://www.wikidata.org/wiki/Q1563068","note":"identity and sense of the item"},{"title":"Wikipedia (de): Massenverhältnis","url":"https://de.wikipedia.org/wiki/Massenverh%C3%A4ltnis","note":"general description of the item"}],"openQuestions":["Should the rocketry sense be a separate entry?","How should CODATA constants be linked?","How should engineering mass ratios be represented?"],"resources":{"spec":"/models/things/publications/thing-q1563068/spec.json"},"provenance":{"origin":"thing registry research (pass 2)","builtFrom":["models/things/publications/thing-q1563068/spec.json"],"providers":["Claude"],"researchStatus":"unreviewed","generatedAt":"2026-09-12T20:13:51Z","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 2026-10-08T19:09:48+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}}