Abstract
A model of the three-body encounters which occur in a dense gas is used to evaluate their effect on the binary diffusion coefficient of a moderately dense gas mixture. The behaviour predicted for the diffusion coefficient as a function of density is in direct opposition to that resulting from the Enskog theory of dense gases in which three-body collisions are neglected. When the entire effect of increasing gas density on the diffusion coefficient is considered an expression is obtained which leads to substantial agreement with available experimental data.
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