amount of substance

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Symbol n. A measure of the number of entities present in a substance. The specified entity may be an atom, molecule, ion, electron, photon, etc., or any specified group of such entities. The amount of substance of an element, for example, is proportional to the number of atoms present. For all entities, the constant of proportionality is the Avogadro constant. The SI unit of amount of substance is the mole.

Subjects: Chemistry.

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