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Avogadro's number, Avogadro's constant
The number of carbon atoms in twelve grams of the carbon-12 isotope.

The relative atomic mass of any element, expressed in grams, contains this number of atoms.

It is named for an Italian physicist Amedeo Avogadro (1776-1856).

This entry is located in the following unit: Measurements and Mathematics Terms (page 2)