In your chapters you have said that air occupies space and i know that air is present all aroun the world but when we sit on a chair the air gets displaced but what happens to it because it is all around the world

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Solution

You are right, air is everywhere ...
Air is a gas so it is very flexible (large inter-molecular spaces) and gets easily displaced. It can also exert pressure on the things around it (like when wind blows) and it does so every time it bumps into its surroundings.
When we sit on a char, the air gets displaced by us and is forced out in to its surrounding space.

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