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Acentric factorIn thermodynamics, the acentric factor ω is a factor originally used by K.S. Pitzer and coworkers as an expression in an equation for the compressibility factor. It is defined as 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:
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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. |