Answer: The law that illustrates this is Boyle's Law
Explanation:
Mathematically,
[tex]P\propto \frac{1}{V}[/tex] (at constant temperature and number of moles)
Mathematically,
[tex]V\propto T[/tex] (at constant pressure and number of moles)
Mathematically,
[tex]V\propto n[/tex] (at constant pressure and temperature)
So, when the volume of the air in the gun decreases, the pressure is increased. The inverse relationship between the volume and pressure of the gas is very well illustrated by Boyle's Law.
Hence, the law that illustrates this is Boyle's Law