The partial molal volumes of gases in water at 0°C

The partial molal volumes of nitrogen, oxygen, and carbon dioxide in water at 0 �C have been determined by a new technique based on the use of a Gilfillan-Polanyi micro-pyknometer as a float. The value obtained for nitrogen is 37.0 ml and that for oxygen, 31 ml. The value for carbon dioxide is found to vary from 44 to 28 ml as the pressure at which the water is saturated with the carbon dioxide varies from 0 to 6 cm Hg. The changes in the density of water at 0 �C produced by saturation with nitrogen, oxygen, and air at 1 atm pressure are -9.3, + 1.8, and -4.7 p.p.m. respectively. The density of air-saturated water is considerably greater than would be expected from the sum of the effects due to nitrogen and oxygen separately.