The Diffusion of Gases at High Pressures. I. The Self-diffusion Coefficient of Carbon Dioxide

Abstract

The self-diffusion coefficients of carbon dioxide were measured over a pressure range from 2 to 250 atm. at 25, 50, and 75°C. The measurements of self-diffusion through a plug of porous bronze were made using the radioactive tracer technique. The products of the density and the diffusion coefficient increase slightly with the density in the region of lower density, below about 10 mol./l., for both isotherms at 50 and 75°C, but they decrease in the region of higher density. These results agree with the results obtained by O’Hern et al., but not with Enskog’s dense gas theory, and not with the values calculated by the generalized chart of Slattery et al.