Wednesday, September 28, 2011

Physics Form 4: Chapter 4 - Charles's Law of Gas

Charles's law states that for a fixed mass of ideal gas, the volume is directly proportional to its absolute temperature at constant pressure.

Explanation of Charles law by the kinetic theory

·         When the temperature of a gas in an enclosed cylinder is raised, the gas molecules receive heat energy and their average kinetic energy increases.
·         This means that molecular velocity will increase and the frequency of collision between the molecules and the wall of the cylinder also increases. Thus, the gas pressure increases.
·         Increase in pressure will cause the piston to be pushed up and this indicates that the volume of the gas has increased.

Click on the diagram below to play!

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