Vapour pressures of (1-chlorobutane + 1-octanol or 1-decanol) at several temperatures between T = 278.15 K and T = 323.15 K were measured by a static method. The reduction of the vapour pressures to obtain activity coefficients and excess molar Gibbs free energies was carried out by fitting the vapour pressure data to the Wilson equation according to Barker's method. A description of the experimental behaviour according to the ERAS-model is presented. (C) 2003 Elsevier Ltd. All rights reserved.