Finds the density, relative density, composition molecular weight, volume flow rate and mass flow rate of a gas when the pressure, temperature and compressibility of the gas at base and line conditions are entered.

Constants for, air compressibility, molecular weight and density are taken from ISO6976:1983, ISO6976:1995 (E) and GPA 2172:1996. The user can specify the standard used for constants.

References
International Standard, ISO6976:1983, Natural Gas – Calculation of calorific values, density, relative density and Wobbe index from composition.
International Standard, ISO6976:1995 (E), Natural Gas – Calculation of calorific values, density, relative density and Wobbe index from composition.
Gas Processors Association, GPA2172:1996, Calculation of Gross Heating Value, Relative Density and Compressibility Factor for Natural Gas Mixtures from Compositional Analysis.