# What is the Boltzmann constant 3

## Boltzmann constant

The Boltzmann constant *k _{B.}* is one of the fundamental natural constants; it is defined as the quotient of energy E and temperature T. In the law for ideal gases it appears as a constant of proportionality via the following relationship:

pV = N k_{B.} T.

### Current value:

Boltzmann constant [3] | ||

Symbols: | k or just _{B.}k | |

Conditions: | - | |

Value: | 1.380 649 x 10^{-23} | J K^{-1} (Joule / Kelvin) |

Standard deviation: | exactly | |

Relative standard deviation: | exactly | |

Presentation: | 1.380649 x 10^{-23} | J K^{-1} |

Exact value in the SI system: | 1.380649 x 10^{-23} | J K^{-1} |

### Older values:

Boltzmann constant | ||

CODATA 2014: | 1.38064852 (79) x 10^{-23} | J K^{-1} |

### Relationships with other sizes

Conversion to electron volts per Kelvin (eV / K) | ||

Symbol: | k | |

Value: | 8.617 3303 x 10^{-5} | eV K^{-1} |

Standard deviation: | 0.000 0050 x 10^{-5} | eV K^{-1} |

Relative standard deviation: | 5.7 x 10^{-7} | |

Presentation: | 8.6173303 (50) x 10^{-5} | eV K^{-1} |

### Sources and further information

[1] - **Boltzmann Constant**.

Definition in *IUPAC Gold Book*, (1996), DOI 10.1351 / goldbook.A00543.

[2] - CODATA:**Boltzmann Constant**.*The NIST Reference on Constants, Units, and Uncertainty*, 2018.

[3] - David B Newell et al .:**The CODATA 2017 Values of h, e, k, and N_{A.} for the revision of the SI**.

In:

*Metrologia*, (2018), DOI 10.1088 / 1681-7575 / aa950a, open access.

**Category: data and tables**

**Updated on **April 18, 2020.

**Permalink**: https://www.internetchemie.info/chemie-lexikon/daten/b/boltzmann-konstante.php

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