The Avogadro constant (symbols: L, NA), also called the Avogadro number is the number of "entities" (usually, atoms or molecules) in one
mole, that is the number of
carbon-12 atoms in 12
grams (0.012
kg) of unbound carbon-12 in its ground state. The current best estimate of this number is: The value of the number was first indicated by
Johann Josef Loschmidt, who in 1865, computed the number of particles in one cubic centimetre of gas in standard conditions. The term
Loschmidt constant is thus more correctly applied for this latter value, which can be said to be proportional to the Avogadro number. However, in
German language literature, "Loschmidt constant" is used to refer to both this usage, as well as the number of entities in a mole.
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