Gas Z factor

This app calculates the gas compressibility factor Z with five differents correlation with:

- Papay

- Dranchuk-Purvis-Robinson

- Hall-Yarborough

- Bill-Beggs

- Dranchuk-Abou Kassem

Using three parameters: pressure, temperature and gas specific gravity it calculate the pseudocritical properties with the Standing correlations that expressed mathematicaly the graphical correlation of Brown et al.