The volume of an ideal gas varies inversely with the pressure. This means as the volume decreases, the pressure increases. As the pressure decreases the volume increases. Look at the blue pressure needle and the green which is the gas in the piston. The the needle goes to higher pressures, the green volume becomes smaller.
The pressure times the volume is a constant at constant temperature and a constant mol amount of gas. This means, for exmaple, if the pressure is halved, the volume becomes double.
The top graphs is when different values of the volume is plotted against the pressure. A hyperbola is observed.
In the bottom graph, different values of the volume is plotted against the inverse of the pressure. A staight line is then observed. Inverse of the pressure means one divided by the pressure.
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