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The expression Gay-Lussac's law is used for each of the two relationships named after the French chemist Joseph Louis Gay-Lussac and which concern the properties of gases, though it is more usually applied to his law of combining volumes, the first listed here. The first law relates to volumes before and after a chemical reaction while the second concerns the pressure and temperature relationship for a sample of gas often known as ''Amontons' Law''. == Law of combining volumes == The law of combining volumes states that, when gases react together to form other gases, all volumes are measured at the same temperature and pressure:
For example, Gay-Lussac found that 2 volumes of Hydrogen and 1 volume of Oxygen would react to form 2 volumes of gaseous water. Based on Gay-Lussac's results, Amedeo Avogadro theorized that, at the same temperature and pressure, equal volumes of gas contain equal numbers of molecules (Avogadro's law). This hypothesis meant that the previously stated result :2 volumes of Hydrogen + 1 volume of Oxygen = 2 volumes of gaseous water could also be expressed as :2 molecules of Hydrogen + 1 molecule of Oxygen = 2 molecule of water. The law of combining gases was made public by Joseph Louis Gay-Lussac in 1808.〔Gay-Lussac (1809) ("Mémoire sur la combinaison des substances gazeuses, les unes avec les autres" ) (Memoir on the combination of gaseous substances with each other), ''Mémoires de la Société d'Arcueil'' 2: 207-234. Available in English at: (Le Moyne College ).〕〔(【引用サイトリンク】title=Joseph-Louis Gay-Lussac )〕 Avogadro's hypothesis, however, was not initially accepted by chemists until the Italian chemist Stanislao Cannizzaro was able to convince the First International Chemical Congress in 1860.〔Hartley, Harold (1966). "Stanislao Cannizzaro, F.R.S. (1826 – 1910) and the First International Chemical Conference at Karlsruhe". Notes and Records of the Royal Society of London 21: 56–63. .〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Gay–Lussac law」の詳細全文を読む スポンサード リンク
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