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Avogadro constant facts for kids

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Amadeo Avogadro
Value of NA in various units
6.02214179(30)×1023 mol−1
2.73159757(14)×1026 lb-mol−1
1.707248479(85)×1025 oz-mol−1

The Avogadro constant (symbols: L, NA) is the number of particles (usually atoms or molecules) in one mole of a given substance. Its value is equal to 6.02214129(27)×1023 mol−1. The constant was named after the Italian scientist Amedeo Avogadro.

The measurement of Avogadro's constant was refined in 2011 to 6.02214078×1023 ± 0.00000018×1023.

An old term closely related to the Avogadro constant is Avogadro's number. Avogadro's number is the number of atoms in 12 grams of the carbon isotope carbon-12. Avogadro's number is a dimensionless quantity and has the numerical value of the Avogadro constant given in base units.

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