Abstract
When a gas diffuses in a liquid under normal conditions, and the concentration of the diffusing gas is small, the general practice is to assume a constant diffusion coefficient. Recent work on the CO 2-water system reported that the “integral” diffusion coefficient of CO 2 decreased about 30 per cent when the initial concentration of CO 2 was increased from 0 to 60 per cent of the equilibrium value. A careful study in a liquid jet has been made of the diffusion of CO 2 in water at 25°C as a function of solute concentration to test the reported results. While a slight variation of diffusivity may have been observed, it was not statistically significant; for all practical purposes the diffusion coefficient of CO 2 in water can be considered to be constant.
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