Loschmidt number
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In chemistry and physics, the Loschmidt number is the number density of an ideal gas at standard temperature and pressure,
- .
It is named after the Austrian chemist Johann Josef Loschmidt, who calculated, in 1865, the number of molecules of such a gas in one cubic centimeter.
It is also used as synonym for Avogadro's constant; this use is considered archaic in English language, while it is still current in other languages, e.g. in German scientific literature and textbooks.