The excess molar volume V-m(E) of (cyclohexanone + benzene, or toluene, or ethylbenzene, or styrene) were obtained from the densities measured by means of a vibrating-tube densimeter over the whole composition range at temperatures (293.15, 303.15, 313.15, 323.15, 333.15, 343.15, 353.15) K and atmospheric pressure. The excess molar volume V-m(E) of V-m(E) M provide the temperature dependence 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 ni systems studied increase with rising temperature. (C) 2004 Elsevier Ltd. All rights reserved.