Research

Former Knowledge
Boyle's Law
According to Boyle's Law, pressure is inversely related to the volume of a gas, but at a constant Kelvin Temperature(Celsius + 273).In addition to this (p1)(v1)=(p2)(v2), and as pressure gains the volume drops, or as the volume gains the pressure drops.(p1^), (v1 v)(v1 ^), (p1 v)

P=Pressure in Atmospheric Pressure(atm)
V=Volume in Liters(L)
T=Temperature in Kelvins(K or 273 +Celsius)

Charles Law
According to Charles' Law it says the volume of a fixed mass of gas is directly proportional to it's kelvin temperature if the pressure is kept constant.
Therefore V1/T1=V2/T2, so as the V1 or volume rises the temperature or T1 rises also, or vice-versa.Gay-Lussacs'sGay-Lussacs's law says that pressure of a gas is directly proportional to the kelvin temperature if the volume remains constant.
So P1/T1=P2/T2, so the relationship is directly proportional and just like Charles law the if the pressure or P1 rises the temperature T1 also rises or vice-versa.

Combined Gas Law
The combined gas law describes the relationship among the pressure, temperature, and volume of an enclosed gas, but this only works if the gas is constant. So P1V1/T1=P2V2/T2.


Research
This painting of a cannon from 1326, suports our idea of pressure build up; the pressure will build up in a larger area and will come out of smaller area to push the cannonball.