In this experimental investigation, the bubble points of three binary mixtures consisting of propylene oxide + ethyl benzene, propylene oxide + 2-methylpentane, and propylene oxide + 2-methyl-1-pentene were determined. The method of experimentation was the synthetic method in which phase change for a mixture of constant overall composition is observed visually by varying pressure at constant temperature. Each binary system was measured for a range of concentrations. Temperatures and pressures also varied from 323 K to 373 K and up to 5 bar, respectively. It is observed that the solubility of propylene oxide varies, in increasing order, in 2-methylpentane, 2-methyl-1-pentene, and ethyl benzene, with the solubility being far greater in ethyl benzene compared to either 2-methylpentane or 2-methyl-1-pentene. (C) 2013 Published by Elsevier B.V.