**pressure**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 Robert Boyle*

Because

**pV = constant**that means that p_{1}V_{1}= constant and so does p_{2}V_{2}. We can therefore write:

where

V

_{1}= equals the original volume,V

_{2 }= equals the new volume,p

_{1}= the original pressure, andp

_{2}= 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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