The experimental viscosities of the saturated gas expanded liquid system of acetone and carbon dioxide were determined under pressure using a falling-weight viscometer. System pressures and temperatures were manipulated as independent variables to simultaneously influence system properties of liquid phase compositions, densities, volume expansions and viscosities. Liquid viscosities were measured and presented as a function of other system properties. Viscosity measurements were conducted at constant system temperatures of 25, 30, 35 and 40 degrees C, and at system pressures corresponding to liquid compositions between 0 and 0.90 carbon dioxide mole fractions along all four isotherms. Viscosity reduction was observed to be a function of increasing carbon dioxide concentration in the liquid phase, liquid volume expansion, liquid density and system pressure. A high degree of linear correlation was observed throughout the entire experimental envelope when viscosity reduction was presented as a function of liquid phase composition. Analysis of data obtained in this study in conjunction with results of previous research [R. Sih, F. Dehghani, N.R. Foster, Viscosity measurements on gas expanded liquid systems. Methanol and carbon dioxide, journal of Supercritical Fluids 41 (2007) 148-157; R. Sih, M. Armenti, R. Mammucari, F. Dehghani, N.R. Foster, Viscosity measurements on saturated gas-expanded liquid systems. Ethanol and carbon dioxide, journal of Supercritical Fluids 43 (2008) 460-468] shows that the viscosity behavior of independent gas expanded liquid systems consisting of carbon dioxide and either methanol, ethanol or acetone were universally related to system composition, organic solvent species and system temperature. (C) 2008 Elsevier B.V. All rights reserved.