The densities of (cyclohexanone + o-xylene, or m-xylene, or p-xylene) were measured at temperatures (293.15, 303.15, 313.15, M 323.15, 333.15, 343.15, 353.15) K and atmospheric pressure by means of a vibrating-tube densimeter. The excess molar volume V-m(E) calculated from the density data provide the temperature dependence of V-m(E), in the temperature range of (293 to 353) K. The V-m(E) results were correlated using the fourth-order Redlich-Kister equation, with the maximum likelihood principle being applied for the determination of the adjustable parameters. It was found that the V-m(E), in the systems studied increase with rising temperature. (C) 2004 Elsevier Ltd. All rights reserved.