This paper reports the densities of aqueous VOSO4 that were measured gravimetrically at temperatures from (283.15 to 323.15) K. The apparent molar volume, V-phi(B), the partial molar volume of VOSO4, V-B, and coefficient of thermal expansion of the solution, alpha, were calculated. The values of the apparent molar volume, V-phi(B), were fitted to Pitzer's model for volumetric properties by the method of least-squares, which allowed the partial molar volume of the VOSO4 at infinite dilution, V-B(0), and Pitzer's parameters, beta((0)V)(MX), beta((1)V)(MX), and beta((2)V)(MX), to be obtained. The small standard deviations of the fits show that Pitzer's model is also appropriate for representing the volumetric properties of aqueous solutions of VOSO4.