Pressure-density-temperature ( p-p-T) relations of CHF 3, N 2O, and C 3H 6 in the critical region

Abstract

The pressure-density-temperature ( p-ϱ-T) relations in the critical region (0.996 < T r< 1.004 and 0.6 < ϱ r < 1.4) are determined for CHF 3, N 2O, and C 3H 6 by means of a direct method. The critical properties are determined from a logarithmic plot based on the power law for the vapor-liquid coexistence curve and the p-ϱ relation on the critical isotherm for each system. The restricted linear model, one of the simplest scaled equations-of-state, is applied to describe the p-p-T relations in the critical region.