Dalton’s law of partial pressures /dôl″tənz/ [John Dalton, English chemist and mathematician, 1766–1844] , (in physics) a law stating that in a mixture of nonreacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases in the same quantity at the same temperature. See also Avogadro’s law, Boyle’s law, Gay-Lussac’s law.
