The thermo-osmosis of gases through a membrane. II. Experimental

Abstract

An apparatus is described for the measurement of the thermo-osmotic effect of carbon dioxide, nitrogen, hydrogen and water vapour through a natural rubber membrane. The existence of the effect is demonstrated in all four cases. The experimental results are in accord with the theoretical expressions of part I concerning the rate of penetration through the membrane and the pressure ratio at the stationary state. The calculated values of the heat of transport are discussed with special reference to a molecular-kinetic theory of diffusion in quasi-crystalline lattices.