Avogadro constant
| 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 Avogadro constant (symbols: L, NA) is the number of physical constant and 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.
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.
Avogadro Constant Media
Approximate definition of a mole based on 12 grams of carbon-12
French physicist and Nobel laureate (1870-1942) Jean Perrin.
Portrait plaque of Johann Josef Loschmidt on the wall of a building in Vienna (Lacknergasse 79). *Taken 2018-02-27 16:41:13 at GPS coordinates 48.227339, 16.333528 (per EXIF).*Plaque at Google coordinates 48.227285, 16.333515 per Google Street View. This file is a copy of
- Wien18 Lacknergasse079 2018-
Related pages
References
- ↑ Mohr, Peter J.. CODATA Recommended Values of the Fundamental Physical Constants: 2006. Rev. Mod. Phys. 80 (2008). p. 633–730. doi:10.1103/RevModPhys.80.633. Direct link to value.
- ↑ Johnston, Lesley. Salters Advanced Chemistry: Revise Chemistry For Salters AS (2008)Heinemann. p. 2. ISBN 978-0-435-63154-3.
- ↑ Avogadro constantNational Institute of Standards and Technology. Retrieved 2013-11-07.
- ↑ Andreas, Birk. Determination of the Avogadro Constant by counting the atoms in a 28Si Crystal. Physical Review Letters 106 (3) (2011). p. 030801. doi:10.1103/PhysRevLett.106.030801.
