Excess volumes for binary mixtures of tetrachloroethylene with hexane, heptane, cyclohexane, methylcyclohexane, toluene, bromobenzene, chlorobenzene and nitrobenzene have been determined dilatometrically at 303.15 K. The measuredVEvalues are negative for the mixtures of tetrachloroethylene with hexane, heptane and nitrobenzene and are positive for the systems containing cyclohexane, methylcyclohexane and toluene. In case of tetrachloroethylene + bromobenzene and + chlorobenzene systems inversion of sign ofVEis observed. The data are interpreted in terms of (1) loss of dipolar association, difference in size and shape of the molecules and (2) specific interactions between unlike molecules.