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In the Soave–Redlich–Kwong (SRK) equation of state (EOS), the compressibility factor occurs as a solution of the following cubic equation: ... , where ... and ... with ... , ... , ... , and ... . Here ... is the acentric factor, ... and ... are the critical temperature and pressure, and ... = ... is the reduced pressure. When ... and ... are greater than one, the supercritical behavior is observed with ... varying continuously between low (close to zero, liquid-like behavior) and high values (near one, vapor-like behavior). For specific values of ... and ... (when ... , the saturation pressure, and ... ), one gets three roots with the smallest and largest corresponding to the liquid and vapor phases. The intermediate value of ... has no physical significance. The Demonstration plots ... for ethane ( ... , ... , and ... ) and displays the location and values of its real roots.

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      EUN,LOM,LRE4,work-cmr-id:397032,http://demonstrations.wolfram.com:http://demonstrations.wolfram.com/CubicEquationOfStateForTheCompressibilityFactor/,ilox,learning resource exchange,LRE metadata application profile,LRE

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