VISCOSITY OF TOLUENE AND BENZENE UNDER HIGH-PRESSURE

The viscosity of toluene and benzene was measured al the temperatures of 298.15, 323.15, 348.15, and 373.15 K (ITS-90) from atmospheric pres sure up to 200 MPa, by a torsionally vibrating quartz-crystal viscomet er, with an estimated accuracy of 0.5 %. The experimental data for eac h temperature were fitted with a Tait-like equation, by a non linear i terative program based on the Marquardt-Levenberg method. A comparison between present data and available data from other authors, whenever possible, was made in terms of the dispersion of each data set with re spect to the Tait-like equation.