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AVOGADRO CONSTANT

Avogadro’s number (Avogadro constant) is the number of particles ( atoms, molecules, ions) in one mole of a substance. It is designated as N_A and is equal to (6,022045±0,000031)·10²³ mole^-1. It is one of the most important fundamental physical constants. There are more than 20 independent methods how to evaluate the Avogadro’s number.