In existographies, Amedeo Avogadro (1776-1856) (IQ:175|#285) (GCE:21) (CR:11) was an Italian chemist noted for []
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Overview
In 1811, Avogadro, in his "Essay on Determining the Relative Masses of the Elementary Molecules of Bodies", advanced the hypothesis that all gases under the same conditions of temperature and pressure, in unit volume, have the same number of molecules.
The formulation of Avogadro’s law, supposedly was one of the first to coin the term “molecule”, as differing from an atom.
The following is the Avogadro constant NA:

$N_{\rm A}=6.022 \times 10^{23} \left ( \frac{entities}{mol} \right ) \,$

Thermodynamics
In thermodynamics, the ideal gas constant R divided by the Avogadro constant is the Boltzmann constant kB:

$k_{B} = \frac{R}{N_{\rm A}}\,$

which is used a good deal in statistical thermodynamics.

In 1895, German chemist Walther Nernst wrote an early book on chemical thermodynamics based on Avogadro's law. [1]

References
1. Nernst, Walther. (1895). Theoretical Chemistry: from the Standpoint of Avogadro’s Rule & Thermodynamics (section: The Measure of Affinity, pgs. 586-88). MacMillan and Co.