The kelvin is the SI unit of thermodynamic temperature, and one of the seven SI base unitsSI base unitsThe SI comprises a coherent system of units of measurement starting with seven base units, which are the second (symbol s, the unit of time), metre (m, length), kilogram (kg, mass), ampere (A, electric current), kelvin (K, thermodynamic temperature), mole (mol, amount of substance), and candela (cd, luminous intensity) ...
› wiki › International_System_of_UnitsInternational System of Units - Wikipedia. ... Unusually in the SI, we also define another unit of temperature, called the degree Celsius (°C).