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 states must license and recognize same-sex marriages. Consequently, same-sex marriage is legal in all 50 states, the District of Columbia, Puerto Rico, Guam, U.S. Virgin Islands and Northern Mariana Islands. Officials in American Samoa are discussing whether the ruling applies to the territory; currently same-sex marriages are neither licensed nor recognized there. The Supreme Court decision legalizing same-sex marriage in the states and territories did not legalize same-sex marriage on Indian lands. In the United States, Congress (not the federal courts) have legal authority over Indian country. Thus, unless Congress passes a law imposing same-sex marriage on Indian tribes, federally