For $1 \ mol$ of $CO_2$ gas at $300 \ K$ temperature and $40 \ atm$ pressure occupying a volume of $0.4 \ L$,the compressibility factor $Z$ indicates that the gas is:

The pressure of a real gas is less than the pressure of an ideal gas because of .....

Pressure versus volume graph for a real gas and an ideal gas are shown in the 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.

In a $P$ versus $V$ graph,the horizontal line is found in which region?

When does a real gas behave like an ideal gas?

Write the van der Waals equation.