Wikidata facts
- Image
- Derived Planck Units CODATA 2014.png
Show 4 more facts
- numeric value
- 0.00000002176434
- conversion to SI unit
- 0.00000002176434
- conversion to standard unit
- 21.764
- Wikidata SPARQL query equivalent
- wd:Q592634 p:P2370/psn:P2370 [wikibase:quantityAmount ?source; wikibase:quantityUnit ?base]. ?item p:P2370/psn:P2370 [wikibase:quantityAmount ?target; wikibase:quantityUnit ?base]. BIND(?source / ?target as ?value)
Sources (1)
via Wikidata · CC0
~23 min read
Article
A mass–radius log plot of various objects
In particle physics and physical cosmology, Planck units are a system of units of measurement defined exclusively in terms of four universal physical constants: c, G, ħ, and kB. Expressing one of these physical constants in terms of Planck units yields a numerical value of 1. They are a system of natural units, defined using fundamental properties of nature (specifically, properties of free space) rather than properties of a chosen prototype object. Originally proposed in 1899 by German physicist Max Planck, they are relevant in research on unified theories such as quantum gravity.