Excess molar volumes V-E of diisopropyl ether with 1-butanol were measured at pressures of 0.1 MPa, 20 MPa, 40 MPa, and 60 MPa and at temperatures of 278.15 K, 298.15 K, and 323.15 K; mixtures of diisopropyl ether + diethyl ketone, at 278.15 and 298.15 K. V-E is negative for all the mixtures studied over the whole concentration range and for all temperatures. Excess molar volumes V-E of ethanol with heptane were measured at 298.15 K and 0.1 MPa, 20 MPa, and 60 MPa. V-E is positive in all mixtures studied. Results were correlated by polynomial equations of the type V-E-x(1)x(2) Sigma(i)A(i)(2x(1)-1)(i).