Density was measured over the whole concentration range for the binary system of poly(ethylene glycol) 300 (PEG 300) + water at five temperatures from (298.15 to 318.15)K. The density (p) is fitted to calculate the excess molar volume (V-m(E)) and viscosity deviation (A The computed results are fitted to a Redlich-Kister equation to obtain the coefficients and estimate the standard deviations between the experimental and calculated quantities. The values of V all mixtures are negative, while the values of Ali are positive over the entire composition range. Crown Copyright (C) 2011 Published by Elsevier B.V. All rights reserved.