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.
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