The Lee, Gonzalez and Eakin correlation, only requires the pressure, temperature and molecular weight of the natural gas, and is relatively accurate compared to more complex methods of predicting viscosity. It still widely used and accepted.
this paper). The correlation has standard deviation of 2.7%, with a maximum deviation of 8.99%. The correlation is
Gas density is predicted by this correlation.
where ρ is the density in g/cm3, P is the pressure in psig, MW is the molecular weight (lb/lbmol), R is the gas constant (10.731 ft3 psi °R−1 lb-mol−1), T is the absolute temperature (°R) and Z is the compressibility factor.