Boltzmann constant
physical constant relating energy at the individual particle level with temperature / From Wikipedia, the free encyclopedia
The Boltzmann constant (k or kB) is a physical constant. It is defined to be 1.380649×10−23 J/K.[1] It relates the average kinetic energy of a particle in a gas with the temperature of the gas. It is the gas constant R divided by the Avogadro constant NA:
- For the constant pertaining to energy of black body radiation see Stefan–Boltzmann constant
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The Boltzmann constant has SI units of J⋅K−1 (also written J/K), the same as entropy. It is named after the Austrian physicist Ludwig Boltzmann.