Calculate gas compressibility factor or Z factor from the virial equation.
The compressibility factor is calculated using the second order virial equation
`Z = (P.vm) / (Ro .T) = 1 + B / (vm) `
`B = a - b.e^(c / T) `
where :
Z = the compressibility factor
P = gas pressure
T = gas temperature
vm = gas mole volume
Ro = the universal gas constant
B = the second order virial coefficient
a, b, c are Virial constants
The gas mole volume is calculated by solving the quadratic equation, and the compressibility factor is calculated from the mole volume.
Reference : Kaye And Laby : Tables Of Physical And Chemical Constants
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