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Dalton's law Dal·ton's law (dôl'tənz)
A principle that each gas in a mixture of gases exerts a pressure proportionately to the percentage of the gas and independently of the presence of the other gases present. Also called law of partial pressures.
the statement that the total pressure of a mixture of gases is equal to the sum of the partial pressures of the individual component gases. The partial pressure is the pressure that each gas would exert if it alone occupied the volume of the mixture at the same temperature.