Kelvin
Symbol: K
The kelvin is a unit increment of temperature and a SI base units. It is defined as one 273.16th of the thermodynamic temperatur of the tripel point of water. The theoretical absence of all thermal energy by definition it is zero kelvins (0 K)
The unit is named after William Thomson, 1st Baron Kelvin, who created the absolute thermometric scale at the age of 24 years.
The magnitude of the degree Celsius is exactly equal to that of the kelvin.