Gas dioxide, and air expand to the same extent over the same 80 kelvin interval. He noted that, for an ideal gas at constant pressure, the volume is directly proportional to its temperature: In 1802, Joseph Louis Gay-Lussac published results of similar, though more extensive experiments. Gay-Lussac credited Charles' earlier work by naming the law in his honor. Gay-Lussac himself is credited with the law describing pressure, which he found in 1809. It states that the pressure exerted on a container's sides by an ideal gas is proportional to its temperature. In 1811, Amedeo Avogadro verified that equal volumes of pure
History of same-sex marriage in the United States states to issue marriage licenses to same-sex couples and to recognize same-sex marriages validly performed in other jurisdictions. This held all state same-sex marriage bans to be unconstitutional and legalized same-sex marriage in all remaining states. The decision came on the second anniversary of the "United States v. Windsor" ruling that struck down Section 3 of the Defense of Marriage Act (DOMA), which denied federal recognition of same-sex marriages. It also came on the twelfth anniversary of "Lawrence v. Texas" which struck down sodomy laws in 13 states. Each justice's opinion on "Obergefell" was consistent with their opinion in "Windsor".