The Boltzmann constant (k or kB) is a physical constant relating energy at the individual particle level with temperature, which must necessarily be observed at the collective or bulk level. It is the gas constant R divided by the Avogadro constant NA:
It has the same dimension (energy divided by temperature) as entropy. It is named after the Austrian physicist Ludwig Boltzmann.
Read more about Boltzmann Constant: Bridge From Macroscopic To Microscopic Physics, Role in The Equipartition of Energy, Role in Boltzmann Factors, Role in The Statistical Definition of Entropy, Role in Semiconductor Physics: The Thermal Voltage, History, Value in Different Units
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—Ovid (Publius Ovidius Naso)