Densities, speed of sound, and derived thermodynamic properties of toluene, tetradecane, and 1-chlorohexane in the compressed liquid region

Abstract

The densities have been measured at temperatures from (273.65–473.15) K and pressures up to 140.1 MPa for toluene, at temperatures from (298.15–433.15) K and pressures up to 100.1 MPa for tetradecane, and 1-chlorohexane. The speeds of sound in liquid toluene and 1-chlorohexane have been measured over the temperature range from (298.15–433.15) K under pressures up to 100.1 MPa. The relative combined expanded uncertainty in the measurement of the density is 0.0003, and of the speed of sound is 0.001, both for 0.99 level of confidence. The values of the heat capacity at constant pressure and at constant volume, isobaric thermal expansivities, isothermal and isentropic compressibilities have been calculated at temperatures between 273.15 K and 473.15 K at pressures up to 140 MPa for toluene, at temperatures between 293.15 K and 433.15 K at pressures up to 100 MPa, for tetradecane, and at temperatures between 298.15 K and 433.15 K at pressures up to 100 MPa for 1-chlorohexane.