Abstract
The viscosity of mixtures of water with a number of organic liquids and of some mixtures of two organics has been analysed in terms of its deviation from "ideality", expressed as ln H = ln η − (x1 ln η1 + x2 ln η2). For most of the systems the quantity ln H is a single-valued and linear, or nearly linear, function of the product y1y2, where[Formula: see text]representing mole fractions (with κ = 0), or volume fractions (κ = 1), or various compromises (0 < κ < 1). Neither extreme, nor any single compromise, expresses the behaviour of all the systems. A linear relation between 1/H and the relative excess volume, suggested on the basis of the free-volume theory of fluidity, is shown to represent approximately the behaviour of the mixtures of two organic liquids. It fails with the water–organic mixtures.
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