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The Avogadro constant is a constant equal to the number of constituent particles contained within one mole of substance. It is approximately equal to $$6.02214 \times 10^{23}\text{ mol}^{-1}$$.

A related term is Avogadro's number, a dimensionless constant equal to the number of atoms in a gram of hydrogen. The value of the Avogadro constant, when given in SI base units, is equal to the Avogadro constant.

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