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Virial Formula Modules

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CALCULATOR MODULE : Gas Compressibility Factor   ±

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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CALCULATOR MODULE : Gas Compressibility Factor From The Virial Equation   ±

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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DATA MODULE : Fluid Compressibility Factor ( Open In Popup Workbook )   ±

Fluid ideal gas law Z factor or compressibility factor data.

The Z factor is commonly used to adjust the ideal gas law to account for the behaviour of real gases. The Z factor can be obtained from tables, or calculated using cubic equations of state (Van Der Waals, Peng Robinson, Soave, Redlich Kwong equations), or from other relationships such as the Virial equation.

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