ideal gas

Gas which obeys the equation of state $Math - ei$ (the ideal gas law; $Math - text$ is the pressure, $Math - text$ the volume, $Math - text$ the amount of molecules, $Math - text$ the gas constant and $Math - text$ the thermodynamic temperature). For an ideal gas the fugacity, $Math - text$ , of each constituent B is equal to its partial pressure, $Math - text$ , $Math - ei$ , where $Math - text$ is the amount fraction of B.

Source:

Physical Chemistry Division, unpublished