A new approach to description of the pressure dependence of viscosity

Based on more precise description of the temperature-pressure dependence of entropy, we expand the Avramov’s model. In this way, viscosity or relaxation time are described with better accuracy. It is demonstrated that there is a strong relation between the fragility parameter F, described here, and the fragility parameter m, introduced by Angell, m ≈ ( 13 ± 10 % ) F . Analyses of experimental data on dielectric relaxation of phenylphthalein-dimethylether (PDE) are in agreement with the proposed model.