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
Public opinion of same-sex marriage in the United States opposed and 7% with no opinion. The poll also revealed that 53% of the population in the states that did not allow same-sex couples to marry at the time approved of same-sex marriage. 50% of respondents agreed that the Equal Protection Clause of the Fourteenth Amendment to the United States Constitution guarantees the freedom to marry regardless of sex or sexual orientation, while 41% disagreed, and 9% had no opinion. The same poll also found that 81% of people believed that businesses should not be allowed to refuse to serve gays and lesbians. 16% disagreed, and 3% had no opinion.