SI derived unit
SI derived units are part of the SI system of measurement units and are derived from the seven SI base units.
Units with special names and symbols
Other quantities and units
Conversion between kelvins and degrees Celsius One degree Celsius is equal to 1 kelvin. Temperature in degrees Celsius = Temperature in kelvins - 273.15. Thus, one could think of the Kelvin scale as the same as the Celsius scale, with its zero point moved down to absolute zero. That is historically accurate; however, it has become more convenient to fix the standard for the kelvin, and thus the Celsius scale is derived from that standard (i.e., it now depends on absolute zero and the triple point of water with a 0.01 K offset—the boiling point of water no longer has anything to do with the official definition of degrees Celsius). Temperature differences are often measured in degrees Celsius; however, it doesn't matter: differences in temperature are equivalent whether kelvins or degrees Celsius are used.
See also SI SI base unit Planck units
References I. Mills, Tomislav Cvitas, Klaus Homann, Nikola Kallay, IUPAC: Quantities, Units and Symbols in Physical Chemistry, 2nd edition (June 1993), Blackwell Science Inc (p. 72)
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