Law of corresponding states and thermal-diffusion factor of He-Ar mixtures from two-bulb measurements

Experimental data of the thermal diffusion factor for low density He-Ar mixtures are given. The measurement apparatus is a two-bulb operated at TH = 308 K and TC = 77.6 K, the mean temperature being T = 148 K. It is concluded that the extended law of corresponding states proposed by Kestin, Ro and Wakeham is able to predict in a correct way the obtained results.