Densities of 7-butyrolactone + water and tetrahydrofuran + 7-butyrolactone systems were measured over temperature ranges of 303.15-343.15 and 278.15-298.15 K respectively, and ultrasonic velocities were measured at 298.15 K for the ternary system tetrahydrofuran + water + 7-butyrolactone and all three binary systems Inclusive of the tetrahydrofuran + water system. Excess volumes and excess isentroplc compressibilities were calculated from measured data and reported for all the systems studied. The data have been fitted to empirical models, and the model constants are also reported.
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