Abstract
A theory of diffusion in liquid mixtures is proposed which shows that the intrinsic diffusion coefficient, DA, of the substance A in a mixture of A and B in which the mole fractions are respectively fA and fB is DA = kT/6 (fAηAσA + fBηABσAB) where ηA is the viscosity of the pure liquid A, ηAB is the mutual viscosity of the mixture, and σA and σAB are intermolecular distances. This leads to values of D, the measured diffusion coefficient, which are in good agreement with the experimental values, both in the limiting case when the concentration of one component is very low, and for 50% mixtures.
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