| P31 | instance of | ... | Q21077852 (Wikidata property for physical quantities) | Wikidata property for physical quantities |
| P2302 | property constraint | ... | Q21510856 (required qualifier constraint) | required qualifier constraint |
| P2302 | property constraint | ... | Q21510860 (range constraint) | range constraint |
| P2302 | property constraint | ... | Q21514353 (allowed units constraint) | allowed units constraint |
| P2302 | property constraint | ... | Q52004125 (allowed-entity-types constraint) | allowed-entity-types constraint |
| P2302 | property constraint | ... | Q53869507 (property scope constraint) | property scope constraint |
| P2302 | property constraint | ... | Q21503250 (subject type constraint) | subject type constraint |
| P3254 | property proposal discussion | Url | Wikidata:Property proposal/Archive/38 - Wikidata | ??? |
| P1659 | related property | ... | P9998 (excitation energy) | excitation energy |
| P1896 | source website for the property | Url | Pocket Guide to Chemical Hazards | NIOSH | CDC | ??? |
| P1629 | Wikidata item of this property | ... | Q483769 (ionization energy) | ionization energy |
| P1855 | Wikidata property example | ... | Q517266 (2-heptanone) | 2-heptanone |
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log id: 4352842