Excess molar enthalpies are reported for (propane + butan-1-ol) at the temperatures 298.15 K and 323.15 K, and the pressures 5 MPa and 15 MPa, and at 348.15 K and 363.15 K, and 5 MPa, 10 MPa, and 15 MPa. The results are explained in terms of chemical, physical, and structural effects and compared with the UNIFAC-2 prediction. © 1992 Academic Press Limited All rights reserved.