Densities of aqueous solutions of poly(ethylene glycol) (PEG) have been measured at (300.15, 310.15, 313.15, 318.15, 323.15, and 328.15) K. The number-average molecular weights for PEG were 400, 4000, and 6000. The density data were fitted by a third-order polynomial with respect to mass fracton of the polymer at each temperature. Using the fitted polynomial expression and the Gibbs-Duhem equation, partial molar volumes of PEC and water for various mixtures were computed and reported.