The Temperature Dependence of the Self-Diffusion Coefficients of Argon, Neon, Nitrogen, Oxygen, Carbon Dioxide, and Methane

The self-diffusion coefficients of A, Ne, ${\mathrm{N}}_2$, ${\mathrm{O}}_2$, C${\mathrm{O}}_2$, and C${\mathrm{H}}_4$ have been measured as functions of the temperature: A, Ne, ${\mathrm{N}}_2$, and ${\mathrm{O}}_2$ in the range — 196°C to 80°C, ${\mathrm{CO}}_2$ in the range — 78.5°C to 80°C, and C${\mathrm{H}}_4$ in the range — 183°C to 80°C. The experimental figures have been compared with values calculated on the assumption that the molecular interaction potential is of the form