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The Macedo—Litovitz hybrid equation for the viscosity of liquids is derived using statistical-mechanical arguments. The formulation is based upon the assumption that diffusion in liquids is governed by (1) the presence of an adjacent free volume of certain size into which a molecule can jump and (2) the acquisition of sufficient energy by the diffusing molecule to escape from the force field of its neighbors.
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H. S. Chung (1966) studied this question.
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