Abstract
The vapor-liquid coexistence curve in the critical region of 1,1,2,2-tetrafluoroethane (HFC-134) was measured by a visual observation of the meniscus in an optical cell. Eighteen saturated liquid densities and 10 saturated vapor densities have been obtained in a temperature range from 364 K to the critical temperature, corresponding to a density range from 243 to 1001 kg/m[sup 3]. The experimental uncertainties of temperature and density measurements are estimated to be within [plus minus]10 mK and between [plus minus]0.11% and [plus minus]0.44%, respectively. Not only the level where the meniscus disappeared but also the intensity of the critical opalescence was considered in the determination of the critical temperature and density being 391.74 [plus minus] 0.02 K (ITS-90) and 536 [plus minus] 2 kg/m[sup 3], respectively. The critical exponent of the power law, [beta], was also determined as 0.347 [plus minus] 0.002. A saturated vapor-liquid density correlation has been developed on the basis of the present measurements.
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