| Wikidata property for physical quantities | Q21077852 |
| P3254 | property proposal discussion | https://www.wikidata.org/wiki/Wikidata:Property_proposal/Archive/21#P1295 |
| P1269 | facet of | radiation | Q18335 |
| P2302 | property constraint | subject type constraint | Q21503250 |
| range constraint | Q21510860 | ||
| allowed units constraint | Q21514353 | ||
| property scope constraint | Q53869507 | ||
| P1629 | Wikidata item of this property | emissivity | Q899670 |
| Q899670 | emissivity | Wikidata property | P1687 |
| Q214609 | material | properties for this type | P1963 |
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