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 in the United States Hodges" ended all inter-state legal complications surrounding same-sex marriage, as it orders states to both perform the marriages of same-sex couples and to recognize the marriages of same-sex couples performed in other states. According to the federal government's Government Accountability Office (GAO) in 2004, more than 1,138 rights and protections are conferred to U.S. citizens upon marriage by the federal government; areas affected include Social Security benefits, veterans' benefits, health insurance, Medicaid, hospital visitation, estate taxes, retirement savings, pensions, family leave, and immigration law. Since July 9, 2015, married same-sex couples throughout the United States have equal access to all