Boltzmann constant
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
| Values of k | Units |
|---|---|
| 1.380649×10−23 | J K−1 |
| 8.617333262×10−5 | eV K−1 |
| 1.380649×10−16 | erg K−1 |
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.
References
- SI Brochure: The International System of Units (SI) (PDF) (Ninth ed.), Bureau International des Poids et Mesures, 2019, p. 129, retrieved 2020-01-18
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