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Additional recommended knowledge
Tr stands for the reduced temperature .
For most simple fluids at Tr is close to 0.1, therefore . In many cases, Tr = 0.7 lies near the normal boiling point.
Acentric factor accounts for characteristic of molecular structure. Values of ω can be determined for any fluid from Tc,Pc, and a single-vapor measurement measurment made at Tr = 0.7. Values of ω are tabulated in many thermodynamic tables.
The definition of ω makes its value zero for argon, krypton, and xenon, and experimental data yield compressibility factors for all three fluids that are correlated by the same curves when Z (compressibility factor is represented as a function of Tr and Pr. This is the basic premise of the following three-parameter theorem of corresponding states:
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Acentric_factor". A list of authors is available in Wikipedia.