GMAT
The chemist Amedeo Avogadro (1776 – 1856), positing that equal volumes of different gases, at the same temperature and pressure, would contain equal numbers of molecules, and many scientists doubted that, even if this theory were true, the number could not be ever measured, while in the early 20th century, Perrin measured the value of "Avogadro's number" using several different experimental designs.
The chemist Amedeo Avogadro (1776 – 1856) posited that equal volumes of different gases, at the same temperature and pressure, would contain equal numbers of molecules, and many scientists doubted that, even if this theory were true, the number could ever be measured, but in the early 20th century, Perrin measured the value of "Avogadro's number" using several different experimental designs.
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