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The '''Avogadro constant''' (<math> N_A</math>) in [http://physics.nist.gov/cuu/Units/ Le Système international d'unités] is given by <ref>[http://physics.nist.gov/cgi-bin/cuu/Value?na#mid CODATA]</ref>:
The '''Avogadro constant''' (<math> N_A</math>) in [http://physics.nist.gov/cuu/Units/ Le Système international d'unités] is given by:


:N<sub>A</sub> =  6.02214129      x 10<sup>23</sup> mol<sup>-1</sup>
:N<sub>A</sub> =  6.02214179(30) x 10<sup>23</sup> mol<sup>-1</sup>
==History==
 
The first person to try elucidate an analogous value was [[ Johann Josef Loschmidt]] in 1866 <ref>J. Loschmidt "Zur Grösse der Luftmolecüle", Sitzungsberichte der kaiserlichen Akademie der Wissenschaften zu Wien: Math-Naturwiss., Klasse 2, '''52''' pp. 395–413 (1866) </ref>.
This constant was named after Lorenzo Romano Amedeo Carlo Avogadro by Jean Perrin in 1909 (Ref. 3).
However, this constant was named after Lorenzo Romano Amedeo Carlo Avogadro by Jean Perrin in 1909 <ref>Jean Perrin "Mouvement brownien et réalité moléculaire", Annales de chimie et de physique '''XVIII''' (8e série) pp. 5-113 (1909) [http://gallica.bnf.fr/ark:/12148/bpt6k349481/ Page images on Gallica]</ref>.
==Interesting reading==
*[http://dx.doi.org/10.1119/1.2188962 Ronald Newburgh, Joseph Peidle and Wolfgang Rueckner  "Einstein, Perrin, and the reality of atoms: 1905 revisited", American Journal of Physics '''74''' pp. 478-481 (2006)]
==References==
==References==
<references/>
#[http://physics.nist.gov/cgi-bin/cuu/Value?na#mid CODATA]
;Related reading
#[http://dx.doi.org/10.1007/BF02743188 G. Mana and G. Zosi "The Avogadro constant", La Rivista del Nuovo Cimento '''18''' pp. 1-23 (1995)]
*[http://dx.doi.org/10.1038/179145a0 F. A. Paneth "Avogadro's Number and Loschmidt's Number", Nature '''179''' p. 145 (1957)]
#Jean Perrin "Mouvement brownien et réalité moléculaire", Annales de chimie et de physique '''XVIII''' (8e série) pp. 5-113 (1909) [http://gallica.bnf.fr/ark:/12148/bpt6k349481/ Page images on Gallica]
*[http://dx.doi.org/10.1007/BF02743188 G. Mana and G. Zosi "The Avogadro constant", La Rivista del Nuovo Cimento '''18''' pp. 1-23 (1995)]
*[http://dx.doi.org/10.1119/1.2188962 Ronald Newburgh, Joseph Peidle and Wolfgang Rueckner  "Einstein, Perrin, and the reality of atoms: 1905 revisited", American Journal of Physics '''74''' pp. 478-481 (2006)]
*[http://dx.doi.org/10.1038/467892a  Geoff Brumfiel "Elemental shift for kilo", Nature News '''467''' p. 892 (2010)]
 
[[Category: Physical constants]]
[[Category: Physical constants]]
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