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Thermodynamic properties of 1,1-difluoroethane in the super-critical and high-density regions

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  • Iso, A.
  • Uematsu, M.

Abstract

The volumetric properties of 99.9% pure 1,1-difluoroethane were measured in the range of temperatures from 320 to 400 K by a variable volume method using a metal bellows. The unsmoothed 221 PVT measurements along 14 isotherms, which cover the region of densities between 232 and 883 kg/m3 up to a maximum pressure of 10.0 MPa, are reported. The uncertainties in the temperature, pressure, and density measurements were estimated to be 6 mK, 2.1kPa, and 0.3%, respectively. Based in these results, the derivatives were calculated and the behavior of the isothermal compressibility and volume expansion coefficient in the high-density region is shown as a function of temperature and pressure. Thevapor pressures were also measured at seven different temperatures of 320, 350, 353.16, 360, 380, 384.95, and 385 K, and the results are compared with the data in the literature. Saturated vapor and liquid densities were measured to confirm the reliability of the present results.

Suggested Citation

  • Iso, A. & Uematsu, M., 1989. "Thermodynamic properties of 1,1-difluoroethane in the super-critical and high-density regions," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 156(1), pages 454-466.
    • Handle: RePEc:eee:phsmap:v:156:y:1989:i:1:p:454-466
    DOI: 10.1016/0378-4371(89)90134-9
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    References listed on IDEAS

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    1. Takahashi, Yasushi & Toyoda, Tadashi, 1986. "The Ehrenfest theorem for the charged quantized Schrödinger field with arbitrary spin," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 138(3), pages 501-506.
    2. Watanabe, Toshio, 1987. "Kazushi Okawa, ed., Japan and Developing Countries:A Comparative Analysis," Economic Review, Hitotsubashi University, vol. 38(4), pages 378-380, October.
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