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Real gases do not obey ideal gas equation under all conditions. They nearly obey ideal gas equation at higher temperatures and very low pressures. However they show deviations from ideality at low temperatures and high pressures. The deviations from ideal gas behaviour can be illustrated as follows: The isotherms obtained by plotting pressure, P against volume, V for real gases do not coincide with that of ideal gas, as shown below. It is clear from above graphs that the volume of real gas is more than or less than expected in certain cases. The deviation from ideal gas behaviour can also be expressed by compressibility factor, Z. Compressibility factor (Z): The ratio of PV to nRT is known as compressibility factor.
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