The value of Boltzmann's constant ( kB) is 1.380 6503 × 10-23 J·K-1 ( NIST)
The ratio of the universal gas constant to Avogadro's number; equal to 1.38062 X 10-23 joules per Kelvin. Named for Ludwig Boltzmann (1844 -1906), an Austrian physicist.
(Sometimes called gas constant per molecule, Boltzmann's universal conversion factor.) The ratio of the universal gas constant to Avogadro's number; equal to 1.3804 × 1023 W K−1.