A single vaporhyphen;pressure relationship applicable from the triple point to the critical point has been found to exist for the inert gases argon, krypton, and xenon when the reduced vapor pressurePRis related toTRthe reduced temperature. This vaporhyphen;pressure function resulted from the Frosthyphen;Kalkwarf Eq. (12) and can be expressed aslogPRequals;agr;plus;lpar;bgr;sol;TRrpar;plus;ggr;thinsp;logTRplus;0.1832thinsp;lpar;PRsol;TR2rpar;,where 0.1832 is a universal constant. For these inert gases bgr;=minus;2.2936 and ggr;=minus;2.6786 while agr; can be calculated from the boundary condition, agr;+bgr;+0.1832=0.The vaporhyphen;pressure data for helium and neon produced similar reducedhyphen;vaporhyphen;pressure relationships having different constants. These results are not unexpected in view of the significant quantum effects associated with helium and to a lesser degree with neon. Values calculated with this reducedhyphen;vaporhyphen;pressure equation have been found to be in excellent agreement with experimental values reported for argon, krypton, and xenon. The average deviation for these gases was 0.63, for neon 1.51, and for helium 0.79.
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