# Binary Diffusion Coefficients for Gases

Binary Diffusion Coefficients for Gases

Binary diffusion coefficients at low to moderate pressures (such that the ideal gas behavior is valid) can be predicted with reasonable accuracy (to within about 5% of experimental data) from the kinetic theory of gases using results from the Chapman–Enskog theory based on the Lennard–Jones (6-12) potential [1].

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In this Demonstration, you can select a pair of molecules from the pull-down menus and then use the sliders to select a temperature and pressure for the process. The binary diffusion coefficient for the selected gas pair is shown in a contour plot. You can also view the binary mixture parameters and the molecular parameters for the selected binary mixture.

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