Why does the pressure of a gas decrease as the volume increases?

Why does the pressure of a gas decrease as the volume increases?
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Answer :

As the volume is decreased, the same number of molecules of airhave a smaller space to move freely in. The number of collisions ofmolecules of air with the walls of the container per unit timeincreases. Since pressure is the force exerted over an area, thepressure increases.
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