Gas phase PVT properties for the difluoromethane + pentafluoroethane (R-32 + 125) system

Heng Liang Zhang, Haruki Sato, Koichi Watanabe

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48 Citations (Scopus)


We present new PVT measurements in the gas phase for difluoromethane (R-32) + pentafluoroethane (R-125) mixtures at 0.5001 (30.24 mass %) and 0.6977 (50.01 mass %) mole fractions of difluoromethane (R-32). The measurements were performed with a Burnett apparatus, and the expanded uncertainties of the measurements with a level of confidence of approximately 99% were estimated to be ±0.8 kPa for pressure, ±8 mK for temperature, ±0.15% for density, and ±0.1 mol % for composition. The PVT properties of pure R-32 and R-125, which were obtained from the reanalysis of earlier Burnett measurements for R-32 and R-125 at our laboratory, are also presented in this paper. A virial-type equation of state for the R-32 + 125 system has been developed on the basis of the present measurements and other experimental data; this equation reproduces the experimental data in the gas phase within ±0.3% in pressure.

Original languageEnglish
Pages (from-to)1401-1408
Number of pages8
JournalJournal of Chemical and Engineering Data
Issue number6
Publication statusPublished - 1996

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)


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