Interfacial tension data obtained over the aqueous surfactant (sodium dodecyl sulfate) concentration range of (0 to 34.68 × 10 -5 ) mol‚L -1 , the pH range of 4 to 9, and the temperature range of (20 to 50)°C are presented for the recommended chemical system of cumene and water. The measurements were made using an automatic DuNoü y tensiometer, and interfacial tension values ranged from (27.3 to 37.0) mN‚m -1 . The data show a nonlinear decrease with increasing surfactant concentration and pH; however, there is a linear decrease with increasing temperature. The interfacial pressure was also derived. The interfacial tension and interfacial pressure values were correlated by empirical equations.

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