Gaseous Diffusion in Neon-Noble-Gas Systems

Diffusion coefficients of all four neon–noble-gas binary systems are reported as determined with a two-bulb apparatus over the temperature range o°-120°C. The experimental values, reduced to 1 atm pressure and trace composition of the heavier component, can be described by the expressions He–Ne, log10D12 = 1.631 log10T − 4.0051; Ne–Ar, log10D12 = 1.672 log10T − 4.6357; Ne–Kr, log10D12 = 1.757 log10T − 4.9332; Ne–Xe, log10D12 = 1.690 log10T − 4.8308. The present data are in favorable accord with the results of other workers and with diffusion coefficient values that are derived from studies of the composition dependence of the viscosity coefficient. Values derived from the composition dependence of the thermal conductivity coefficient are in fair agreement in general, but this method does not provide nearly as reliable a means of obtaining diffusion coefficient data as does viscosity.