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 pressure up to 200 MPa, by a torsionally vibrating quartz-crystal viscometer, with an estimated accuracy of 0.5 %. The experimental data for each temperature were fitted with a Tait-like equation, by a non linear iterative 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 respect to the Tait-like equation.