Kelvin
The 19th century British scientist Lord Kelvin first developed and proposed the scale. It was often called the "absolute Celsius" scale in the early 20th century. The kelvin was formally added to the International System of Units in 1954, defining 273.16 K to be the triple point of water. The Celsius, Fahrenheit, and Rankine scales were redefined in terms of the Kelvin scale using this definition. The 2019 redefinition of the SI base units now defines the kelvin in terms of energy by setting the Boltzmann constant to ''exactly'' joules per kelvin; every 1 K change of thermodynamic temperature corresponds to a thermal energy change of exactly . Provided by Wikipedia
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