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
History of same-sex marriage in the United States same-sex marriage licenses on October 21, 2013, following a September 27 state superior court decision that found an equal protection right of same-sex couples to marry. It reasoned that with the U.S. Supreme Court's recent action in "United States v. Windsor", couples in New Jersey civil unions lacked access to federal benefits they could now receive if married. Governor Chris Christie, who had vetoed legislation legalizing same-sex marriage in February 2012, filed an appeal to the New Jersey Supreme Court, but withdrew it after the court refused to stay the lower court's ruling. Eight New Mexico counties, either on the