||Ebulliometric Measurement of the Vapor Pressure of Difluoromethane.
Weber, L. A. ;
Goodwin, A. R. H. ;
||National Inst. of Standards and Technology (CSTL), Gaithersburg, MD. Thermophysics Div.;Department of Energy, Washington, DC.;Environmental Protection Agency, Washington, DC.
Vapor pressure ;
Temperature dependence ;
Mathematical models ;
Boiling points ;
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We have used a comparative ebulliometer to make accurate measurements of the vapor pressure of difluoromethane (R32) in the range 49-214 kPa, which corresponds to temperatures on ITS-90 between 208 and 237 K. The results are represented with an Antoine equation and are compared with literature values. We have combined our results with literature values, and we present an interpolating equation for the vapor pressure at temperatures between 190 K and the critical temperature (351.36 K). We also tabulate thermodynamic properties for R32 on the saturation boundary between 200 and 250 K.