The infinite dilution activity coefficients of ether (diethyl ether (DEE), methyl tertiary butyl ether (MTBE) or diisopropyl ether (DLPE)) in alkanol (1-octanol, 1-decanol or 1-dodecanol) were measured in the region of 10-30 degrees C using the gas stripping method. The experimental results were predicted and correlated by a typical group-contribution model, ASOG.