Question

why do gases exents pressure?
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Answer 1

The molecules are continually colliding with each other and with the walls of the container. When a molecule collides with the wall, they exert small force on the wall The pressure exerted by the gas is due to the sum of all these collision forces.The more particles that hit the walls, the higher the pressure.

Answer 2

the molecule are being collided in the container continuesly.

when the molucule collides on the wall it exerts small force on the wall the gas exerts pressure due to some collision.

of these moleculesthe more particles hit the wall,higher pressure.