# Residual Functions for the SRK and PR Equations of State

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In the gas phase, deviation from ideal behavior is taken into account by introducing residual functions, of the form . As pressure approaches zero, the gas behaves like an ideal gas, so that .

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Contributed by: Housam Binous and Ahmed Bellagi (December 2016)

Open content licensed under CC BY-NC-SA

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References

[1] J. M. Smith, H. C. Van Ness and M. M. Abbott, *Introduction to Chemical Engineering Thermodynamics*, 7th ed., Boston: McGraw-Hill, 2005.

[2] J. R. Elliott and C. T. Lira, *Introductory Chemical Engineering Thermodynamics*, 2nd ed., Englewood Cliffs, NJ: Prentice Hall International Editions, 2012.

[3] Aspentech. "Aspen Plus." (Dec 19, 2016) www.aspentech.com/products/engineering/aspen-plus.

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