THE VISCOSITY OF LIQUID TOLUENE AT ELEVATED PRESSURES

This paper reports new measurements on the viscosity of toluene at pressures up to 500 MPa at 299 K and pressures up to 435 MPa at 323 K. The results are in close agreement with recent viscosity measurements from a vibrating-wire viscometer at pressures up to 250 MPa but confirm earlier measurements from a falling-body viscometer which show that the recently recommended polynomial expression for the representation of the pressure dependence of the viscosity of toluene up to 250 MPa underestimates the viscosity if applied at 500 MPa by about 30%. Modification of this polynomial expression by inclusion of one additional term is found to represent the data satisfactorily over the whole pressure range.