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 recognized under the laws of this State as if federal law recognized such marriages in the same manner as the laws of this State so that all marriages receive equal treatment. "§572 - 1 Requisites of valid marriage contract. In order to make valid the marriage contract, which shall be permitted between two individuals without regard to gender, it shall be necessary that: (1) The respective parties do not stand in relation to each other of ancestor and descendant of any degree whatsoever, two siblings of the half as well as to the whole blood, uncle and niece, uncle and