Daltons law of additive pressures: The pressure of a gas mixture is equal to the sum of the pressures each gas would exert if it existed alone at the mixture temperature and volume P T TV RTV 分压力p partial pressureDalton’s law of §9-2 分压定律和分容积定律 additive pressures: The pressure of a gas mixture is equal to the sum of the pressures each gas would exert if it existed alone at the mixture temperature and volume p T V p T V p T V p T V 分压力pi partial pressure