Critical Indices ν and γ Experimentally Obtained at the Liquid–Vapor Critical Point in Fluid Hg

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  • Masanori Inui
    Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
  • Yukio Kajihara
    Graduate School of Integrated Arts and Sciences, Hiroshima University, Higashihiroshima, Hiroshima 739-8521, Japan
  • Koji Ohara
    Research and Utilization Division, Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
  • Kazuhiro Matsuda
    Graduate School of Science, Kyoto University, Kyoto 606-8502, Japan
  • Daisuke Ishikawa
    Research and Utilization Division, Japan Synchrotron Radiation Research Institute, SPring-8, Sayo, Hyogo 679-5198, Japan
  • Shinya Hosokawa
    Department of Physics, Graduate School of Science and Technology, Kumamoto University, Kumamoto 860-8555, Japan

Description

The critical indices ν and γ near the liquid–vapor critical point in fluid Hg were obtained by small-angle X-ray scattering measurements at high temperatures and high pressures. Although both critical indices determined by the least-squares fitting technique are consistent with values predicted by the mean field theory, the result indicates a possibility that fluid Hg belongs to the 3D Ising universality class when the accuracy of experimental data is considered. This result suggests that insulating fluid Hg behaves like a van der Waals fluid.

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