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# Peng–Robinson EOS @model

@wikipedia

One of the cubic equations of real gas state defining the Compressibility factor $//$ as a function of fluid pressure $//$ and fluid temperature $//$:

 (1)
 (2)
 (3)
 (4)
 (5)

where

 $//$ Compressibility factor $//$ Critical pressure $//$ Fluid pressure $//$ Сritical temperature $//$ Fluid temperature $//$ Reduced pressure $//$ Gas constant $//$ Reduced Temperature $//$ Acentric factor

Once compressibility Z-factor $//$ is known the fluid density $//$ can be calculated as:

 (6)

where

 $//$ fluid molar mass

Real Gas ]

# Reference

1. Ding-Yu Peng and Donald B. Robinson, A New Two-Constant Equation of State, Industrial & Engineering Chemistry Fundamentals , 1976, 15 (1), 59-64, doi.org/10.1021/i160057a011

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