Boltzmann constant

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 1.380649×10⁻²³ J/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:

[math]\displaystyle{ k = \frac{R}{N_{\rm A}}\, }[/math]

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.

Boltzmann Constant Media

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  Ludwig Boltzmann (1844-1906), Austrian physicist

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  Boltzmann's grave in the Zentralfriedhof, Vienna, with bust and entropy formula.