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Avogadro constant

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The Avogadro constant ( N_A) in Le Système international d'unités is given by [1]:

NA = 6.02214129 x 1023 mol-1


The first person to try elucidate an analogous value was Johann Josef Loschmidt in 1866 [2]. However, this constant was named after Lorenzo Romano Amedeo Carlo Avogadro by Jean Perrin in 1909 [3].


  2. J. Loschmidt "Zur Grösse der Luftmolecüle", Sitzungsberichte der kaiserlichen Akademie der Wissenschaften zu Wien: Math-Naturwiss., Klasse 2, 52 pp. 395–413 (1866)
  3. Jean Perrin "Mouvement brownien et réalité moléculaire", Annales de chimie et de physique XVIII (8e série) pp. 5-113 (1909) Page images on Gallica
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