PRESSURE DEPENDENCIES OF THE THERMAL-DIFFUSION FACTORS, ALPHA(T), OF 9 HELIUM-FLUOROETHANE SYSTEMS AT 300 K - PREDICTION OF THE VARIATION WITH TEMPERATURE OF THE LIMITING DIFFUSION-COEFFICIENTS OF THESE SYSTEMS FROM ALPHA(T) VALUES AT ZERO PRESSURE

Thermal diffusion factors, alpha(T), are reported at 300 K for nine bi nary systems consisting of helium and a fluoroethane. The data are ext rapolated to zero pressure to test the approximate theory of Oost et a l. for the pressure dependence of alpha(T). The zero pressure values o f alpha(T) are used to predict the temperature dependence of the binar y diffusion coefficients of these systems. (C) 1996 American Institute of Physics.