Avogadro's Number
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Avogadro's number is the count of entities in one mole, fixed by 2019 SI redefinition at 6.02214076×10^23 per mole.
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A mole of carbon atoms and a mole of water molecules hold this same fixed count, though their masses differ.
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Older sources call this figure "experimentally determined"; the 2019 redefinition made it an exact constant, not a measured one.