# Boltzmann constant facts for kids

*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** (*k* or *k*_{B}) is a physical constant. It is defined to be 649×10^{−23} 1.380J/K. 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 *N*_{A}:

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.

## Images for kids

All content from Kiddle encyclopedia articles (including the article images and facts) can be freely used under Attribution-ShareAlike license, unless stated otherwise. Cite this article:

Boltzmann constant Facts for Kids. *Kiddle Encyclopedia.*