Difference between revisions of "Avogadro constant"
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The '''Avogadro constant''' (symbol: '''''L''''' or '''''N''<sub>A</sub>''') is a [[physical constant]] that relates measurements made at the macroscopic scale to those made on an atomic scale. It is usually defined as the number of entities (such as atoms or molecules) in one [[mole (unit)|mole]], and the 2006 [[CODATA recommended value]] is {{nowrap|6.022 141 79(30){{e|23}} mol<sup>−1</sup>}}. It was orginally called '''Avogadro's number''', and is named in honour of the Italian physicist [[Amadeo Avogadro]]. | The '''Avogadro constant''' (symbol: '''''L''''' or '''''N''<sub>A</sub>''') is a [[physical constant]] that relates measurements made at the macroscopic scale to those made on an atomic scale. It is usually defined as the number of entities (such as atoms or molecules) in one [[mole (unit)|mole]], and the 2006 [[CODATA recommended value]] is {{nowrap|6.022 141 79(30){{e|23}} mol<sup>−1</sup>}}. It was orginally called '''Avogadro's number''', and is named in honour of the Italian physicist [[Amadeo Avogadro]]. | ||
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| + | ==Proposed redefinition== | ||
| + | In the context of the "[[New SI]]", based around the redefinition of the [[kilogram]] in terms of a universal [[physical constant]], there have been several proposals that would give the Avogadro constant a defined value in [[SI units]]. | ||
==Notes and references== | ==Notes and references== | ||
Revision as of 16:12, 18 August 2010
The Avogadro constant (symbol: L or NA) is a physical constant that relates measurements made at the macroscopic scale to those made on an atomic scale. It is usually defined as the number of entities (such as atoms or molecules) in one mole, and the 2006 CODATA recommended value is 6.022 141 79(30) × 1023 mol−1. It was orginally called Avogadro's number, and is named in honour of the Italian physicist Amadeo Avogadro.
Proposed redefinition
In the context of the "New SI", based around the redefinition of the kilogram in terms of a universal physical constant, there have been several proposals that would give the Avogadro constant a defined value in SI units.
Notes and references
Notes
References
External links
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See also the corresponding article on Wikipedia. |
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