Abstract
Ultrasonic speeds in {(1 − x)C 6H 5Cl + xC 6H 5Br} were measured by a pulse method employing 1 MHz at 303.15 K under pressures up to 200 MPa. Densities under high pressure were calculated from experimental results with reasonable accuracy by use of the pressure dependency of the ultrasonic speed. From these values, the excess isentropic compressibility was derived. The results showed small positive values under the experimental conditions. When pressure was raised, the values at x = 0.5 decreased greatly at first, and those for the higher-pressure region were found to remain nearly constant.
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