The dielectric relaxation time of rigid polar molecules in dilute solutions is shown to depend exponentially on an effective molecular radius which is independent of the solvent. This relation contains a temperature-dependent structure parameter, the coefficients of which are used to calculate the activation energy and -entropy of the rate process. The resulting entropies are now more satisfying due to a new formulation of the scattering factor. Similarly the viscosity of the solvent and its structure parameters are related by an exponential law. A characteristical length in this relation is a measure of the "hole distance" of the rate process. From both exponential laws follows that the dielectric relaxation time raised to the power of the ratio of effective molecular radius to hole distance is proportional to the viscosity of the solvent
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F. Hufnagel (1970) studied this question.
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