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Avogadro's number
The '''Avogadro constant''' (symbols: ''L'', ''N''A), also called the '''Avogadro number''' is the number of "entities" (usually, atoms or molecules) in one mole,   that is the number of carbon-12 atoms in 12 grams (0.012 kg) of unbound carbon-12 in its ground state. The current best estimate of this number is 
 
N_A = (6.022 \, 141 \, 79\pm 0.000 \, 000 \, 30)\,\times\,10^{23} \mbox{ mol}^{-1} \,
 
Last modified: 19.09.07 by jross  
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