An empirical correlation for estimating diffusivities of gases in non-electrolytes at 25°C has been developed. The solute-solvent diffusivity has been correlated as a function of the solute and solvent molar volumes at their normal boiling point and the solvent viscosity. The temperature dependence is expressed by a second equation of the Arrhenius type. The proposed expression, in spite of its simplicity, predicts diffusivities with similar or better accuracy than the equations used for comparison. A nomograph based on the two proposed equations has been constructed.
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Dı́az et al. (1987) studied this question.
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