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Question
Pressure versus volume graph for a real gas and an ideal gas are shown in figure. Answer the following questions on the basis of this graph.
(i) Interpret the behaviour of real gas with respect to ideal gas at low pressure.
(ii) Interpret the behaviour of real gas with respect to ideal gas at high pressure.
(iii) Mark the pressure and volume by drawing a line at the point where real gas behaves as an ideal gas.
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Solution
(i) At low pressure, the curve of real gas coincides with that of ideal gas, this shows that the deviation of behaviour of real gas with respect to ideal gas is small or negligible.
(ii) At high pressure, the curve of real gas is far apart from ideal gas, this shows that the deviation of behaviour of real gas with respect to ideal gas is large.
(iii) The pressure p1 and volume V1 are the point where real gas behaves as an ideal gas. 
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