Isochoric p–ρ–T Measurements for 2,2-Dichloro-1,1,1-Trifluoroethane (R123) at Temperatures from 176 to 380 K and 1-Chloro-1,2,2,2-Tetrafluoroethane (R124) from 104 to 400 K at Pressures to 35 MPa

The p \ T relationships were measured for 2,2-dichloro-1,1,1-trifluoroethane (R123) and 1-chloro-1,2,2,2-tetrafluoroethane (R124) by an isochoric method with gravimetric determinations of the amount of substance. Temperatures ranged from 176 to 380 K for R123 and from 104 to 400 K for R124, while pressures extended up to 35 MPa. Measurements were conducted on com- pressed liquid samples. Most published p \ T data are in good agreement with this study. The uncertainty is 0.03 K for temperature and 0.010 for pressure at p>3 MPa and 0.050 at p<3 MPa. The principal source of uncertainty is the cell volume (t28.5 cm3), with a standard uncertainty of 0.003 cm3. When all components of experimental uncertainty are considered, the expanded relative uncertainty (with a coverage factor k=2 and, thus, a 2-SD estimate) of the density measurements is estimated to be 0.050.