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Even Avogadro Didn’t Know Avogadro’s Number

Rhett Allain Wired
Avogadro's number is sort of like a bridge. It bridges chemistry and atomic physics. In chemistry we measure bulk properties like mass, pressure, volume, temperature. However, when we consider these things from an atomic perspective we look at individual atoms and the momentum, velocity of these particles. Avogadro's number connects these two ideas and allows us to explore atomic-level things by measuring macroscopic level quantities. It’s a big deal.
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