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Wednesday, September 14, 2011
Physics Form 4: Chapter 4 - Boyle's Law of Gas
Boyle's law states that the
of a fixed mass of gas is
inversely proportional to the volume of gas
provided the temperature of the gas is constant.
The law was first proposed in 1662 by
pV = constant
that means that p
= constant and so does p
. We can therefore write:
= equals the original volume,
= equals the new volume,
= the original pressure, and
= the new pressure.
Explanation of Boyle's law by the kinetic theory:
At constant temperature, the average kinetic energy of the gas molecules is constant.
When the gas is compressed, the volume is decreased. Therefore, the number of molecules per unit volume will increase.
The rate of collision of the gas molecules with the wall of container will increase.
Thus, the pressure of gas increases.
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