SUPPLEMENTARY MEASUREMENTS OF THE (P,P,T)-RELATION OF CARBON-DIOXIDE IN THE HOMOGENEOUS REGION AT T=313-K AND ON THE COEXISTENCE CURVE AT T=304-K

This paper presents accurate (p, p, T) measurements on highly pure car bon dioxide in the homogeneous region at T = 313 K for densities betwe en 340 kg.m(-3) and 720 kg.m(-3). The measurements (21 values) have be en carried out to determine reference values for an apparatus speciall y developed for (p, p, T) measurements in the immediate vicinity of th e critical point. The total uncertainty of the measurements in pressur e is less than or equal to (\0.7.10(-4).p\ to \1.0.1.0(-4).p\) for den sities between 340 kg.m(-3) and 580 kg.m(-3) (critical density p(c) = 467.6 kg.m(-3)) and for p > 580 kg.m(-3) the total uncertainty in dens ity is less than or equal to \1.8.10(-4).rho\. Furthermore, the vapour pressure, the saturated-liquid density, and the saturated-vapour dens ity at T = 304 K (T-c = 304.134 K) have been determined. The new exper imental results have been compared with the results of other workers. Based on the saturation densities measured in this work and on previou s measurements, the critical temperature was redetermined as T-c = (30 4.134 +/- 0.010) K. (C) 1997 Academic Press Limited.