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The phase diagram was determined for the system water, phenethyl alcohol and a commercial surfactant, Laureth 4 (Brij® 30), and the vapor pressure of phenethyl alcohol (PEA) measured in the entire system. The phase diagram showed complete solubility of the surfactant and the phenethyl alcohol with limited solubilization of water. The water was dissolved into the surfactant forming a surfactant solution...