Avogadro constant

fundamental physical constant (symbols: L,Nᴀ) representing the molar number of entities
(Redirected from Avogadro's number)

The Avogadro constant (symbols: L, NA) is the number of particles (usually atoms or molecules) in one mole of a given substance.[2] Its value is equal to 6.02214129(27)×1023 mol−1.[3] The constant was named after the Italian scientist Amedeo Avogadro.

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

The measurement of Avogadro's constant was refined in 2011 to 6.02214078×1023 ± 0.00000018×1023.[4]

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.

Related pagesEdit

ReferencesEdit

  1. Mohr, Peter J. (2008). "CODATA Recommended Values of the Fundamental Physical Constants: 2006" (PDF). Rev. Mod. Phys. 80: 633–730. Bibcode:2008RvMP...80..633M. doi:10.1103/RevModPhys.80.633. Unknown parameter |coauthors= ignored (|author= suggested) (help) Direct link to value.
  2. Johnston, Lesley (2008). Salters Advanced Chemistry: Revise Chemistry For Salters AS (Second ed.). Heinemann. p. 2. ISBN 978-0-435-63154-3.
  3. "Avogadro constant". National Institute of Standards and Technology. Retrieved 2013-11-07.
  4. Andreas, Birk; et al. (2011). "Determination of the Avogadro Constant by counting the atoms in a 28Si Crystal". Physical Review Letters. 106 (3). arXiv:1010.2317. Bibcode:2011PhRvL.106c0801A. doi:10.1103/PhysRevLett.106.030801.