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Avogadro number comparison table
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physico chemical constant   changes in value are due solely to an increase in measurement accuracy or convention fundamental physical constant 
Avogadro numberAmadeo Avogadro0.00000047 × 1023 mol-1The number of atoms in 12 grams of carbon 12. The number of atoms in a gram-atom (mass in grams numerically equal to the atomic weight) or the number of molecules in a gram-molecule (mass in grams numerically equal to the molecular weight).6.02214199 × 1023 mol-1NA physico chemical constant

Next physico chemical constant: Boltzmann constant    Up: physico chemical constant    Previous physico chemical constant: atomic mass constant