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 unions in the United States law. The federal Defense of Marriage Act in 1996, prompted by fears of an adverse result in Hawaii's lawsuit "Baehr v. Miike", defined a marriage explicitly as a union of one man and one woman for the purposes of all federal laws (See ), which was ultimately ruled unconstitutional by the Supreme Court in "United States v. Windsor" on June 26, 2013. As a result, shortly after "Windsor" was decided, a number of federal areas ranging from veteran benefits to immigration were clarified as applying equally to same-sex couples. The movement to obtain civil marriage rights and benefits for same-sex