Viscosity of toluene and benzene under high pressur

Tile viscosity of toluene and benzene was measured at tile temperatures of 298.15. 323.15, 348.15, and 373.15 K I ITS-90I from atmospheric pressure up to 2(10 MPa, by a torsionally vibntting quartz-crystal viscometer, with an estimated acctLracy of 0.5 %. The exl~erimental data for each temperature were fiued 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.