Avogadro proposed what is now known as Avogadro's Hypothesis in 1811. The hypothesis states that at the same temperature and pressure, equal volumes of gases contain the same number of molecules or atoms. When this is combined with Gay-Lussac's Law of Combining Volumes, he proposed that the only possible formulas for hydrogen, oxygen and water are H2, O2 and H2O. However, Avogadro's Hypothesis was a radical statement at the time and was not widely accepted until fifty years later.
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Equals...At equal levels of temperature and pressure, equal volumes of gases contain the same number of molecules or atoms.
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50 Years...It took over fifty years for Amedeo's proposal to actually take effect.
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