Proper noun
Avogadro constant
(chemistry, physics) The number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10. By definition, the number of elementary entities (atoms or molecules) comprising one mole of a given substance.
Synonyms: Avogadro's constant, Avogadro's number
All silicon-based approaches would fix the Avogadro constant but vary in the details of the definition of the kilogram. Source: Internet
By fixing the Avogadro constant, the practical effect of this proposal would be that the uncertainty in the mass of a 12 C atom—and the magnitude of the kilogram—could be no better than the current 50 ppb uncertainty in the Planck constant. Source: Internet
As described in Carbon 12 above, this method would define the magnitude of the kilogram in terms of a certain number of 12 C atoms by fixing the Avogadro constant; the silicon sphere would be the practical realization. Source: Internet
Avogadro's number, and its definition, was deprecated in favor of the Avogadro constant and its definition. Source: Internet
As of the 2006 CODATA recommended values, the relative uncertainty in determinations of the Avogadro constant by the X-ray crystal density method is main, about two and a half times higher than that of the electron mass method. Source: Internet
As with a definition based upon carbon 12, the Avogadro constant would also have been fixed. Source: Internet