Abstract
The vapor-liquid coexistence curves in the critical region of difluoromethane (HFC-32) and pentafluoroethane (HFC-125) were measured by a visual observation of the meniscus in an optical cell. Seventeen saturated-liquid and 13 saturated-vapor densities have been measured in a temperature range from 330 K to the critical temperature, corresponding to a density range from 218 to 790 kg -3 for HFC-32. Sixteen saturated-liquid and 13 saturated-vapor densities have been measured in a temperature range from 331 K to the critical temperature, corresponding to a density range from 342 to 895 kg -3 for HFC-125. The experimental uncertainties of temperature and density measurements are estimated to be with ±10 mK and between ±0.10% and ±0.42%, respectively.
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