Real gases below critical pressure and above the critical temperature
obey perfect gas law which is a combination of Boyle’ s and Charle’ s law.
Boyle’ s law states that for constant temperature, the density varies directly as absolute pressure.
Charle’ s law states that for constant pressure, the volume of a given mass
of gas varies as its absolute pressure.
Thus, pv = mRT
On molal basis, the above equation is expressed as
1. Isothermal process: An isothermal process in the one in which temperature
remains constant.
i.e. pv = Constant.
2. Adiabatic Process: An adiabatic process in the one in which there is no heat transfer
to and from the gas. i.e. pvr = Constant,
where r is the ratio of specific heat of gas at constant pressure and constant volume.= Cp/Cv, 1.4 for air.
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