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# Express z in terms of a and b ?

Asked by rbhatt16 4th October 2017, 6:28 PM

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We have not understood the query that you have posted. We would request you to clarify / provide additional details so that we may answer this to the best of the ability.

From the question asked, it seems about Calculation for the compressibility factor,

Compressibility factor of gases is a thermodynamic property which is used to modify the ideal gas equation for real gases.

For Ideal gases,
PV = nRT

For real gases,
PV = ZnRT, (Z is the compressibility factor for the given gas)

The compressibility factor of a gas depends on the particular gas as well as temperature and pressure conditions.

Various equations of state can be used for calculation of compressibility factor of a gas as a function of temperature and pressure. Using different equations of state, various equations are derived for compressibility factor calculation. The constant parameters used in these equations are empirically determined for a gas.

Compressibility charts express compressibility factor values as a function of reduced temperature and reduced pressure.

Reduced temperature, Tr = T / Tc
Reduced pressure, Pr = P / Pc

where Tc and Pc are critical temperature and pressure values respectively.

Answered by Expert 5th October 2017, 12:21 PM
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