Atomic theory formula for the water molecule (HO), or 16 if one assumes the modern water formula (HO). The flaw in Dalton's theory was corrected in principle in 1811 by Amedeo Avogadro. Avogadro had proposed that equal volumes of any two gases, at equal temperature and pressure, contain equal numbers of molecules (in other words, the mass of a gas's particles does not affect the volume that it occupies). Avogadro's law allowed him to deduce the diatomic nature of numerous gases by studying the volumes at which they reacted. For instance: since two liters of hydrogen will react with just one liter
Same-sex unions in the United States law. The federal Defense of Marriage Act in 1996, prompted by fears of an adverse result in Hawaii's lawsuit "Baehr v. Miike", defined a marriage explicitly as a union of one man and one woman for the purposes of all federal laws (See ), which was ultimately ruled unconstitutional by the Supreme Court in "United States v. Windsor" on June 26, 2013. As a result, shortly after "Windsor" was decided, a number of federal areas ranging from veteran benefits to immigration were clarified as applying equally to same-sex couples. The movement to obtain civil marriage rights and benefits for same-sex