Molar excess volumes have been determined from density measurements of the liquid mixtures of trans-1,2-dichloroethene and of cis-1,2-dichloroethene + heptane, +decane, +dodecane, +tetradecane, +hexadecane, and +2,2,4-trimethylpentane at 293.15 K and 313.15 K and atmospheric pressure. For the same mixtures the molar excess enthalpies were measured by means of a flow microcalorimeter of the Picker type at 293.15 K and atmospheric pressure.