Diffusivity of gases in liquids.

Diffusion coefficients of H(2), Ne, N(2), Ar, CH(4), Cl(2), CF(4), C(2)H(6), SF(6), I(2), and isotopic CCl(4), all in CCl(4), determined at atmospheric pressure, are linear functions of temperature, converging to zero at the temperature where CCl(4) ceases to be fluid. The slopes of these lines increase with decreasing molecular cross-section of the diffusants, and with increasing entropy of expansion of the diffusants in CCl(4). Diffusivities in (C(4)F(9))(2)N, whose molecules are very large and three-armed, do not converge as temperature is decreased. Molecules of H(2), Ne, and, to a lesser extent, Ar, are able to diffuse in (C(4)F(9))(2)N even at temperatures where fluidity is low.