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
Status of same-sex marriage recognition of same-sex marriages performed in other states. DOMA also denied federal recognition to same-sex couples who were legally married under state law. On 26 June 2013, the U.S. Supreme Court declared Section 3 of DOMA to be unconstitutional in "United States v. Windsor". The court said that the provision was "a deprivation of the equal liberty of persons that is protected by the Fifth Amendment." With this ruling the federal government recognized same-sex marriages performed by states that allowed same-sex marriage. It also affected several federal rights, including enabling a U.S. citizen to petition a same-sex spouse for immigration.