In numerous research areas knowledge of aqueous solutions viscosity is very important to interpret the experimental data or to use it in simulation studies. When Kumar's semitheoretical equation fur prediction of the dynamic viscosity of a solution of a single electrolyte is modified for prediction of kinematic viscosities, it is found that the resulting expression is valid both for salts and for certain organic solutes. The parameters characterizing individual solutes in aqueous solution at temperatures between 293.1 and 323.1 K also allow prediction of the kinematic viscosities of solutions of multiple solutes in the same temperature and concentration range, with overall errors of <2.5% in 36 of 39 multi-component systems. (C) 2001 Elsevier Science B.V. All rights reserved.