Calculate gas compressibility factor or Z factor.
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 canbe calculated using either the Peng Robinson, Soave, Redlich Kwong or Van Der Waals cubic equations of state (EOS), or using the virial equation.
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