### Gas Compressibility Factor "Z" - Redlich-Kwong Method

The Redlich-Kwong generalised equation of state provides a simple
method for estimating the compressibility factor, Z, of real gases.
While the method is not accurate enough for royalty metering
applications, it is plainly sufficient for sizing valves or other
problems where an estimate of the gas density is required. Typically,
Z is estimated to +/- 5%.

** Z calculator**

Normal conditions are 0°C and 101.325 kPa

Standard conditions are 60°F and 14.695 psi

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