Avogadro constant: Difference between revisions - Wikipedia

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In [[chemistry]] and [[physics]], the '''Avogadro constant''' (symbols: ''L'', ''N''_A) is defined as the ratio of the number of entities (usually [[atom]]s or [[molecule]]s) ''N'' in a sample to the amount of substance ''n'' (unit mole) through the relationship ''N''_A = ''N''/''n''.<ref>{{GreenBook2nd|page=4}}</ref> 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.<ref name=CODATA>{{CODATA2006|url=http://physics.nist.gov/cgi-bin/cuu/Value?na}}</ref> The Avogadro constant expresses the number of elementary entities per mole of substance and it has the value {{val|6.02214179|(30)|e=23|u=mol^-1}}.<ref name=CODATA>{{CODATA2006|url=http://physics.nist.gov/cgi-bin/cuu/Value?na}}</ref><ref>

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