Final answer:
Amadeo Avogadro proposed the hypothesis that equal volumes of different gases contain the same number of molecules, known as Avogadro's Law.
Explanation:
Amadeo Avogadro was the first to hypothesize that, at fixed temperature and pressure, equal volumes of different gases contain the same number of molecules. This idea later became known as Avogadro's Law. His contribution led to the naming of the number of particles in one mole as Avogadro's number.
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