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
Same-sex marriage in the United States In 2015, John Lewis, a leader of the civil rights movement and a chairman of the SNCC, welcomed the outcome of the landmark civil rights case of "Obergefell v. Hodges" in which the Supreme Court of the United States struck down all state bans on same-sex marriage, stating that "races don't fall in love, genders don't fall in love—people fall in love". The NAACP, the leading African-American civil rights organization, has pledged its support for gay rights and same-sex marriage, stating that they "support marriage equality consistent with equal protection under the law provided under the Fourteenth Amendment of the