Graham's law has come to denote an important class of finely divided materials. Around the time Graham did his work, the concept of molecular weight was being established largely through the measurements of gases. Daniel Bernoulli suggested in 1738 in his book Hydrodynamica that heat increases in proportion to the velocity, and thus kinetic energy, of gas particles. Italian physicist Amedeo Avogadro also suggested in 1811 that equal volumes of different gases contain equal numbers of molecules. Thus, the relative molecular weights of two gases are equal to the ratio of weights of equal volumes of the gases. Avogadro's insight together with
Same-sex marriage law in the United States by state Same-sex marriage law in the United States by state This article summarizes the same-sex marriage laws of states and similar jurisdictions in the United States. Via the case "Obergefell v. Hodges" on June 26, 2015, the Supreme Court of the United States legalized same-sex marriage in a decision that applies nationwide, with the possible exception of American Samoa and some tribal jurisdictions. Same-sex marriages are currently licensed and recognized in all U.S. states, District of Columbia, territories, excepting the aforementioned American Samoa and some Native American tribal jurisdictions. Texts:<br> ALABAMA CONSTITUTION - Amendment 774. Sanctity of Marriage Amendment (=Ref.1, cited