Lecture 6 – Effect of Pressure on a fixed Volume of Gas at constant Temperature

ACKNOWLEDGEMENT:

Figure	Source of Figure
Figure 9a	seanlinnane.blogspot.com
Figure 9b	seanlinnane.blogspot.com
Figure 9c	cnx.org

Case 2: Effect of Pressure on a fixed Volume of gas at constant Temperature:

Figure 9a:

Figure 9b:

Figure 9a shows a gas jar containing a certain volume of gas V1 at a pressure of P1 subtended by the piston. The pressure on the piston is increased to P2 and it is pushed down to compress the gas to a volume of V2. The particles are now compressed in a smaller volume, therefore, they collide more often among themselves and the walls of the container, increasing the pressure of the gas to P2.

Therefore, it can be concluded that the volume of a gas decreases with increase in pressure, at constant temperature.

Boyle’s law stated this effect as:

“At a constant Temperature, the Pressure of a gas is inversely proportional to its Volume.

Mathematically:

Graphically: Figure 9c