Measurements of the Vapor-Liquid Coexistence Curve and Determination of the Critical Parameters for R 114

Yukihiro Higashi, Masahiko Uematsu, Koichi Watanabe

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The measurements of the vapor-liquid coexistence curve in the critical region for R 114 (C2Cl2F4) were made by visual observation of the disappearance of the meniscus at the vapor-liquid interface within an optical cell. Twenty-three saturated densities between 410 K and critical temperature were obtained in the range of densities 290 to 894 kg/m3. The experimental errors of temperature and density were estimated within ±15mK and ±0.5%, respectively. On the basis of these results, the critical temperature Tc and the critical density ρc for R 114 were determined to be 418.78 K and 576 kg/m3, respectively, in consideration of the disappearing meniscus level as well as the intensity of the critical opalescence. The critical pressure Pc for R 114 was calculated to be 3.252 MPa by the available vapor-pressure correlation with the present value of Tc. In addition, the critical exponent β and the law of rectilinear diameter near the critical point were also discussed.

Original languageEnglish
Pages (from-to)1327-1333
Number of pages7
JournalNihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B
Issue number464
Publication statusPublished - Jan 1 1985
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanical Engineering

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