What Is the Ideal Gas Model?

The Ideal Gas model, available for gases only, uses the ideal gas law to express density as a function of temperature and pressure:

(35)

is absolute pressure given by:

(36)

where is the reference pressure. The piezometric pressure is given by Eqn. 111 and Eqn. 113.

The gas constant is given by , where is the universal gas constant and is the molecular weight.