Abstract
A new method for the determination of the Maxwell relaxation time (MRT) τM for argon, argon-like liquids and water is presented. It is based on the study of the spectral density for the velocity auto-correlation function (VACF) of a molecule. Two inequalities for the MRT having the general character are established. It is noted that the majority of literary data do not satisfy to them. The recommended values of the MRT, obtained with the help of our new approach, for water and argon are presented. It is shown that the notion of the MRT takes meaning only within the temperature intervals: 85K < T < 110K for argon and 273K < T < 400K for water. Improved estimates for the collective contributions to the self-diffusion coefficients of water and argon are presented. A new method for determination of the kinematic shear viscosity with the help of the VACF or its spectral density is proposed.
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