Units and quantities: massFraction, mass, length, carbonFootprintIntensity + percent, kilogram, tonne, metre, millimetre, kilogramCo2eqPerTonne (DPP steel v0.0.2) #116

shortName

massFraction

All 10 entries in this request: massFraction, mass, length, carbonFootprintIntensity, percent, kilogram, tonne, metre, millimetre, kilogramCo2eqPerTonne

objectType

• massFraction: Quantity
• mass: Quantity
• length: Quantity
• carbonFootprintIntensity: Quantity
• percent: MeasurementUnit
• kilogram: MeasurementUnit
• tonne: MeasurementUnit
• metre: MeasurementUnit
• millimetre: MeasurementUnit
• kilogramCo2eqPerTonne: MeasurementUnit

Justification / use case

Part of the dictionary batch for DPP steel content specification v0.0.2 (material-identity/schema#370): 10 new entries in this request, published as one self-consistent batch together with the other nine requests of the epic.

The quantities and measurement units that the numeric data elements of DPP steel content specification v0.0.2 reference (recycled content, carbon footprint, concentration, product mass, nominal dimensions). Every numeric element carries unit (a MeasurementUnit entry) and quantityKind (a Quantity entry), so these must be published together with, or before, the elements that reference them (check 5).

• percent deliberately carries no quantityKind: pinning % to mass fraction would make the one percent entry unusable for anything else. Mass fraction is asserted on each data element instead.
• kilogramCo2eqPerTonne (kg{CO2eq}/t): UCUM ignores annotations, so the code reduces to 0.001 of the unit one. The carbonFootprintIntensity Quantity and the unit's quantityKind keep it apart from %; no conversions are declared, deliberately. Dimension 1 is a UCUM consequence, not a claim that CO2e mass and product mass are commensurable.
• UCUM codes validated on 2026-09-30 against the NLM UCUM service (%, kg, t, m, mm, kg{CO2eq}/t: all valid).
• metre is needed as the coherent SI unit of length.
• ISO 80000 references use the RFC 5141 URN of the dated edition (all three parts: ISO 80000-3:2019, -4:2019, -9:2019 are edition 2). The ISO 80000-9 item number for mass fraction was not verified, so no clause is cited (a wrong clause is worse than none).

Sources verified 2026-09-30: ESPR 2024/1781 (EN/DE OJ), CPR 305/2011 and 2024/3110, UCC 952/2013 and DA 2015/2446, CN Regulation 2658/87, Regulation (EU) 2026/1384 and Implementing Regulation (EU) 2026/1963, the JRC steel DPP draft (2026-03-31; printed page numbers). Every entry carries en and de preferredName and definition.

Entries

1.1 massFraction — Quantity

• preferredName (en): mass fraction
• preferredName (de): Massenanteil
• symbol: en "w"
• definition (en): Quotient of the mass of a constituent and the total mass of the mixture or product that contains it.
• definition (de): Quotient aus der Masse eines Bestandteils und der Gesamtmasse des Gemisches oder Produkts, das ihn enthält.
• dimension: 1
• definitionStandard: ISO 80000-9 · urn:iso:std:iso:80000:-9:ed-2 (ISO 80000-9:2019)
• Content specification v0.0.2 (informative — access / mandatoriness / granularity are membership facets, not part of the entry): Quantity kind of recycledContent, pre-/postConsumerRecycledContent, concentrationValue, concentrationUpperLimit.

1.2 mass — Quantity

• preferredName (en): mass
• preferredName (de): Masse
• symbol: en "m"
• definition (en): Property of a body that determines its resistance to a change of motion and its weight in a gravitational field; base quantity of the International System of Quantities.
• definition (de): Eigenschaft eines Körpers, die seinen Widerstand gegen eine Änderung des Bewegungszustands und seine Gewichtskraft im Schwerefeld bestimmt; Basisgröße des Internationalen Größensystems.
• dimension: M
• coherentSiUnit: → kilogram (new, this request)
• definitionStandard: ISO 80000-4 · 4-1 · urn:iso:std:iso:80000:-4:ed-2 (ISO 80000-4:2019)

1.3 length — Quantity

• preferredName (en): length
• preferredName (de): Länge
• symbol: en "l"
• definition (en): Linear extent in space between two points; base quantity of the International System of Quantities.
• definition (de): Lineare Ausdehnung im Raum zwischen zwei Punkten; Basisgröße des Internationalen Größensystems.
• dimension: L
• coherentSiUnit: → metre (new, this request)
• definitionStandard: ISO 80000-3 · 3-1.1 · urn:iso:std:iso:80000:-3:ed-2 (ISO 80000-3:2019)

1.4 carbonFootprintIntensity — Quantity

• preferredName (en): carbon footprint intensity
• preferredName (de): spezifischer CO2-Fußabdruck
• definition (en): Carbon footprint of a product expressed per unit mass of the product, as mass of carbon dioxide equivalents per mass of product.
• definition (de): Auf die Masseneinheit des Produkts bezogener CO2-Fußabdruck, angegeben als Masse an CO2-Äquivalenten je Masse des Produkts.
• dimension: 1
• legalBasis: Regulation (EU) 2024/1781 · Art. 2(25) · https://eur-lex.europa.eu/eli/reg/2024/1781/oj

1.5 percent — MeasurementUnit

• preferredName (en): percent
• preferredName (de): Prozent
• symbol: en "%"
• definition (en): Dimensionless unit equal to one hundredth (0.01) of the unit one.
• definition (de): Dimensionslose Einheit, die einem Hundertstel (0,01) der Einheit Eins entspricht.
• dimension: 1
• crossReferences: uneceCommonCode P1, ucumCode %, qudtUnit http://qudt.org/vocab/unit/PERCENT

1.6 kilogram — MeasurementUnit

• preferredName (en): kilogram
• preferredName (de): Kilogramm
• symbol: en "kg"
• definition (en): SI base unit of mass.
• definition (de): SI-Basiseinheit der Masse.
• dimension: M
• quantityKind: → mass (new, this request)
• crossReferences: uneceCommonCode KGM, ucumCode kg, qudtUnit http://qudt.org/vocab/unit/KiloGM

1.7 tonne — MeasurementUnit

• preferredName (en): tonne
• preferredName (de): Tonne
• symbol: en "t"
• definition (en): Unit of mass accepted for use with the SI, equal to 1000 kilograms.
• definition (de): Zur Verwendung mit dem SI zugelassene Einheit der Masse, gleich 1000 Kilogramm.
• dimension: M
• quantityKind: → mass (new, this request)
• crossReferences: uneceCommonCode TNE, ucumCode t, qudtUnit http://qudt.org/vocab/unit/TONNE
• conversion: → kilogram (new, this request), factor 1000, offset 0

1.8 metre — MeasurementUnit

• preferredName (en): metre
• preferredName (de): Meter
• symbol: en "m"
• definition (en): SI base unit of length.
• definition (de): SI-Basiseinheit der Länge.
• dimension: L
• quantityKind: → length (new, this request)
• crossReferences: uneceCommonCode MTR, ucumCode m, qudtUnit http://qudt.org/vocab/unit/M

1.9 millimetre — MeasurementUnit

• preferredName (en): millimetre
• preferredName (de): Millimeter
• symbol: en "mm"
• definition (en): Unit of length equal to one thousandth of a metre.
• definition (de): Einheit der Länge, gleich einem Tausendstel Meter.
• dimension: L
• quantityKind: → length (new, this request)
• crossReferences: uneceCommonCode MMT, ucumCode mm, qudtUnit http://qudt.org/vocab/unit/MilliM
• conversion: → metre (new, this request), factor 0.001, offset 0

1.10 kilogramCo2eqPerTonne — MeasurementUnit

• preferredName (en): kilogram CO2 equivalent per tonne
• preferredName (de): Kilogramm CO2-Äquivalent je Tonne
• symbol: en "kg CO2e/t", de "kg CO2e/t"
• definition (en): Unit of carbon footprint intensity equal to one kilogram of carbon dioxide equivalents per tonne of product.
• definition (de): Einheit des spezifischen CO2-Fußabdrucks, gleich einem Kilogramm CO2-Äquivalente je Tonne Produkt.
• dimension: 1
• quantityKind: → carbonFootprintIntensity (new, this request)
• crossReferences: ucumCode kg{CO2eq}/t
• Content specification v0.0.2 (informative — access / mandatoriness / granularity are membership facets, not part of the entry): No UNECE common code asserted.

Reference URIs

Legislation cites the specific OJ expression ELI (…/oj), never the consolidated alias. Standards cite a dated, version-stable identifier: ISO standards the RFC 5141 URN of the edition (urn:iso:std:iso:<number>[:-<part>]:ed-<n>); CEN ENs without an edition-specific public URI a dated URN urn:cen:en:<number>[-<part>]:<year> (urn:cen: is not an IANA-registered namespace — used as a version-stable identifier only). The undated designation stays in name. The convention is recorded in REVIEW.md §3 with this batch.