A System International (SI) unit of thermodynamic temperature scale, commences at absolute zero, equal to 1/273.16 C degree.
See Alexandrite Tsarstone collectors guide, Definition of Kelvin temperature scale, http://w.alexandrite.net/viewpage.html?id=GG-096-00005 (A System International (SI) unit of thermodynamic temperature scale, commences at absolute zero, equal to 1/273.16 C degree.) (as of Apr. 09, 2026, 07:59 GMT).