Theory:

Matter changing it's state due to pressure.
 
In the previous exercise, we study that matter can change its state due to the effects of temperature. But what will happen if we change the pressure? If we start putting pressure and compress a gas enclosed in a cylinder what will be consequences?
 
How will the matter will react due to the pressure changes?
 
The effects of pressure are negligible on solids substances and more on liquid and most on gases.
 
When the pressure is applied to a container of gas, the gas particles come together. When the pressure is increased that reduce the kinetic energy of the particle.
 
When pressure is increased further the gas-particle get near to each other, then converted into the liquid.
 
Therefore, if we apply pressure to the gas particles it converts its state to liquid.