Lecture 5 - Effect of Temperature on Volume of a Gas, at constant Pressure

ACKNOWLEDGEMENT:

Figure	Source of Figure
Figure 8a	https://prezi.com/myiigflss0gg/charless-law/
Figure 8b	https://prezi.com/myiigflss0gg/charless-law/
Figure 8c	www.physics-reference.com

Gases & the effect of temperature and pressure on their volumes:

The particles of the gas are far apart, moving in random directions with their K.E. Therefore, there are large empty spaces between the particles which gives the gases their compressibility. For a fixed volume of gas in a gas jar, the volume of a gas is affected by temperature and pressure.

Case 1: Effect of temperature on Volume of a gas, at Constant Pressure:

Figure 8a:

Figure 8b:

Figure 8a shows a gas jar containing a certain volume of gas V1 at a temperature of T1. The piston exerts a constant pressure P on the Volume V1. The gas is heated to a temperature T2. As the gas is heated, the particles of the gas gain K.E and they start moving with greater velocities and K.E. The start striking/colliding against the piston and to maintain the pressure P, the piston rises; INCREASING the volume of the gas to V2.

Therefore, it can be concluded that gases expand on heating.

Charles’ Law stated this effect as:

“The Volume of a gas is directly proportional to its absolute Temperature, at Constant Pressure.”

Mathematically:

Graphically: Figure 8c

©Tanzeela Zafar Siddiqui