COEXISTING DENSITIES AND VAPOR-PRESSURES FOR R143 FROM 314-K TO 401-KWITH NEW CRITICAL-POINT PROPERTY ESTIMATES

The coexisting densities and vapor pressures of R143 (1,1,2-trifluoroe thane) have been measured at NIST from 314 to 401 K. These results wer e compared with available R143 data. The critical point was not determ ined experimentally because of the temperature limitations of the appa ratus. However, a revised estimate of the critical point based on the new experimental data was obtained by combining a new method of critic al temperature estimation with a previously reported method of critica l density determination. These data and the data of others were repres ented by both the Carnahan-Starling-DeSantis equation of state and the Deiters equation of state. The Carnahan-Starling-DeSantis equation of state better represented the data and is easier to use for the calcul ation of the thermodynamic properties of R143.