In chemistry, the number 6.022 × 10²³, representing the number of atoms, molecules, or particles in one mole of any substance.
Named after Amedeo Avogadro (1776-1856), an Italian physicist and chemist who proposed the law relating gas volume to particle number; the number was named in his honor in the 20th century.
Avogadro's number is so incomprehensibly huge that a mole of sand grains would cover Earth several times over—it's the bridge between the tiny atom world and the everyday objects we can hold.
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