Boltzmann constant

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A topic known well beyond its field, found in many languages.

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What Wikipedia says

The Boltzmann constant (kB or k) is the proportionality factor that relates the average relative thermal energy of particles in a gas with the thermodynamic temperature of the gas.

Excerpt from the Wikipedia article “Boltzmann constant”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Daderot at English Wikipedia, CC BY-SA 3.0, via Wikimedia Commons.