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THE DALTON,S LAW OF PARTIAL PRESSURES.Dalton's law is useful to calculate pressure of a gas collected over water in the labouratery.When a gas is collected by downward displacement of water it became moist due to water vapour

there for,observed pressure is equal to sum of the pressure of dry gas and the pressure of watervapour[aqueous tension].aqueous tension is constant at a particular temperature

vapour pressure of the dry gas is equal to the difference between total pressure and aqueous tension

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