Measurements of vapor pressures and PVT properties of pentafluoroethyl methyl ether and 1,1,1-trifluoroethane

Measurements of the vapor pressures and the PVT properties of pentafluoroethyl methyl ether (CF3CF2OCH3, HFE-245mc) at temperatures from 310 K to the critical temperature (406.8 K) and from (360 to 440) K along 12 isochores, respectively, are reported. Similar measurements on 1, 1, 1-trifluoroethane (CF3CH3, HFC-143a) from (300 to 345.62) K for vapor pressures and from the vicinity of critical temperature to 430 K along 3 isochores for PVT properties have also been conducted. The measurements were performed by using a constant volume method with uncertainties of +/- 10 mK in temperature, +/-1.4 kPa in pressure, and +/-0.2 kg.m(-3) in density. Comparison of the measured vapor pressures of HFE-245mc with the reported correlation shows an excellent agreement within +/-2 kPa. An equation of state recently developed by the present authors was also found to be effective to represent the present PVT properties of HFE-245mc within +/-1% in pressure in the vapor phase and within +/-0.05% in density in the liquid phase.