Isochoric p-ρ-p-T measurements on 1, 1-Difluoroethane (R152a) form 158 K to 400 K and 1,1,1-trifluoroethane (R143a) form 166 K to 400 K at pressures to 35 Mpa
Joe W. Magee
The p-p-T realtionships were measured for difluoromethane (R152a) and 1,1,1-trifluorethane (R143a) by an isochoric method with gravimetric determinations of the amount of substance. Temperatures ranged from 158 to 400 K for R152a and from 166 to 400 K for R134a, while pressures were up to 35 Mpa. Measurements were conducted on compressed liquid samples. Determinations of saturated liquid densities were made by extrapolating each isochore to the vapor pressure, and determining the temperature and density at the intersection. Published p-p-T data are in good agreement with this study. For the p-p-T apparatus, the uncertainty of the temperature is ± 0.003 cm 3. When all components of experimental uncertainty are considered, the expanded uncertainty (at the two-sigma level) of the density measurements is estimated to be 0.05 %.
Isochoric p-ρ-p-T measurements on 1, 1-Difluoroethane (R152a) form 158 K to 400 K and 1,1,1-trifluoroethane (R143a) form 166 K to 400 K at pressures to 35 Mpa, International Journal of Thermophysics
(Accessed June 3, 2023)