WOLFRAM|DEMONSTRATIONS PROJECT

Binary Diffusion Coefficients for Gases

​
A
O
2
B
CO
2
T (K)
296
p (atm)
1

AB
​(T,P) Contour Plot
Binary diffusion coefficients

AB
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].
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

AB
contour plot. You can also view the binary mixture parameters and the molecular parameters for the selected binary mixture.