Calculate gas compressibility factor or Z factor from the cubic equation (Poling).
The compressibility factor is used to account for the non ideal behaviour of real gases. The non ideal gas law is expressed as
`P V = Z Ro T `
where :
P = gas pressure
T = gas temperature
V = gas mole volume
Z = gas compressibility factor
Ro = universal gas constant
The compressibility factor can be calculated using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals cubic equations of state (EOS). The gas data is taken from Poling.
Reference : Poling, Prausnitz And O'Connell : The Properties of Gases And Liquids : McGraw Hill
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