History of chemistry 1808, certain of his central ideas were soon adopted by most chemists. However, uncertainty persisted for half a century about how atomic theory was to be configured and applied to concrete situations; chemists in different countries developed several different incompatible atomistic systems. A paper that suggested a way out of this difficult situation was published as early as 1811 by the Italian physicist Amedeo Avogadro (1776-1856), who hypothesized that equal volumes of gases at the same temperature and pressure contain equal numbers of molecules, from which it followed that relative molecular weights of any two gases are the same as
Same-sex marriage in the United States federal and state case law regarding same-sex marriage: Same-sex marriage in the United States Same-sex marriage in the United States expanded from one state in 2004 to all fifty states in 2015 through various state court rulings, state legislation, direct popular votes, and federal court rulings. Same-sex marriage is also referred to as gay marriage, while the political status in which the marriages of same-sex couples and the marriages of opposite-sex couples are recognized as equal by the law is referred to as marriage equality. The fifty states each have separate marriage laws, which must adhere to rulings by the