Thermal conductivity of the binary mixtures of O2–He, O2–Ne, O2–Kr, and O2–Xe have been measured at 30°C and 45°C for various compositions by using the thick-wire-variant of the hot-wire method. For pure O2 the experimental value of the thermal conductivity is lower than that given by the recent theory of Hirschfelder based on the assumption of local chemical equilibrium, and consequently the values calculated from Hirschfelder's formula for the mixture conductivities are also expected to be higher than the experimental values which is actually found to be so for the mixtures investigated here. The agreement becomes excellent when the experimental values of the conductivity of pure O2 are used to calculate the mixture conductivities. The formula for the mixture conductivities has been tested in detail and was found to give satisfactorily the composition dependence. The simpler formula for the thermal conductivity of gas mixtures given by Mason and Saxena has also been tested.

The thermal conductivity of pure oxygen, nitrogen, and hydrogen gases and of the binary gas mixtures O2—A, N2—A, and H2—A at several concentrations have been measured by using a thick-wire conductivity cell at 38°C. These data have been used to calculate the Eucken factor for the diatomic gases and the binary gas mixtures. The experimental value of the thermal conductivity and the Eucken factor have been compared with the theoretical values obtained on the Lennard-Jones (12:6) model. Hirschfelder's recent expression for the thermal conductivity of polyatomic gas mixtures has also been tested at some length. It is found that Hirschfelder's expression is substantially correct in its dependence on the individual conductivities.

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