ULTRASONIC SPEEDS IN LIQUID 1,1-DICHLORO-1-FLUOROETHANE AT TEMPERATURES FROM 283 TO 373-K AND PRESSURES UP TO 50-MPA

The ultrasonic speeds, u, in the liquid phase of 1,1-dichloro-1-fluoroethane, CCl2FCH3, were measured along 11 isotherms from 283 to 373.15 K and from 0.1 MPa or near the vapor pressure to about 50 MPa. The measurements were carried out by a sing-around technique operated at a frequency of 2 MHz with an uncertainty of less than +/-0.2%. The ultrasonic speeds and related thermodynamic properties for CCl2FCH3 appear to have characteristics different from those for CCl3F and CHCl2CF3 reported elsewhere.