Compressibilities of liquid pentadecylcyclohexane and nonadecylcyclohexane from high pressure speed of sound and density measurements
Résumé
The speed of sound in liquids pentadecylcyclohexane (C21H42) and nonadecylcyclohexane (C25H50) was measured by means of a pulse technique operating at 3 MHz. The measurements were carried out at pressures up to 150 MPa in the temperature range (303.15 to 383.15) K. Additional density measurements were performed up to p = 60 MPa in the same range of temperature. From both measurements, the density was evaluated up to p = 150 MPa and the isentropic compressibility was determined in the same pressure-temperature domain. The full density data were represented by a Tait-like equation in order to calculate the isothermal compressibility.