Paris, France/paris7-200

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This was the old mansion of Berthollet. Eventually many international scientists were to visit, including John Dalton, Humphry Davy, and Jöns Jakob Berzelius. Some of the research that was conducted here that was critically important to the development of the Periodic Table included Gay-Lussac's research with gases. Gay-Lussac the data for several gaseous reactions, notably oxygen + hydrogen yielding water (other examples: HCl and NH3; SO2 and O2) and discovered that his reactions involved the combination of volumes of gases in small ratios as well. Meanwhile, Avogadro in Italy explained Gay-Lussac's findings by hypothesizing that equal volumes of gases (at the same temperature and pressure) contained equal volumes of molecules. Hence, evidence for Dalton's atomic theory {LINK: Manchester015} was found. Another bit of critically important research was that of Dulong, who in this mansion found that the heat capacities derived from many elements varied inversely with the atomic weight of an element, formulated in Dulong-Petit Law.