Boltzmann constant
The Boltzmann constant (kB or k), named after Ludwig Boltzmann, is a physical constant relating energy at the individual particle level with temperature. It is the gas constant R divided by the Avogadro constant NA:
The Boltzmann constant has the dimension energy divided by temperature, the same as entropy. The accepted value in SI units is 64852(79)×10 J/K. 1.380