Johann Josef Loschmidt is a name that might not ring many bells, yet everyone who took chemistry in junior college had surely come across Loschmidt’s groundbreaking contribution to science. Loschmidt calculated the exact number of elementary units (atoms or molecules) that one mole of a substance contains—a number that bears the name of an Italian scientist, which is unfortunate, because even this celebrated Italian scientist didn’t know its value. That number is Avogadro's number, or Avogadro's constant.
Avogadro's Number. Photo: Ronnie Pitman/Flickr
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Johann Josef Loschmidt And Avogadro’s Number
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