Liquid densities, rho, of binary mixtures of ethanoic acid and trichloroethylene with 1,2-dimethylbenzene, 1,3-dimethylbenzene, and 1,4-dimethylbenzene were measured over the entire range of composition at (293.15, 298.15, and 303.15) K and at ambient pressure (81.5 kPa). The excess molar volumes, V-m(E), for the binary mixtures were calculated. The excess molar volumes of trichloroethylene with dimethylbenzenes are negative over the whole mole fraction range and become more negative with increasing temperature. The V-m(E) values are positive for binary mixtures of ethanoic acid with dimethylbenzenes and become more positive with increasing temperature. Also, the dynamic viscosity, eta, and refractive indices, n(D), were measured at 298.15 K. The excess molar volume and viscosity were compared with some values of literature at different temperatures and pressures.