Avogadro constant

n chemistry and physics, the Avogadro constant (symbols: L, NA) is defined as the ratio of the number of constituent particles (usually atoms or molecules) N in a sample to the amount of substance n (unit mole) through the relationship NA = N/n.[1] Thus, it is the proportionality factor that relates the molar mass of an entity, i.e. the mass per amount of substance, to the mass of said entity.[2] The Avogadro constant expresses the number of elementary entities per mole of substance and it has the value 6.02214179(30)×1023 mol-1.[2][3][4]
Previous definitions of chemical quantity involved Avogadro's number, a historical term closely related to the Avogadro constant. Revisions in the base set of units of the International System of Units (SI) necessitated

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