Question

Give reason: a gas exert pressure on the walls of the container

Answer 1

Here is your answer :-

The molecules are continually run over with each other and the walls in the container. 

While the molecule crashes with the wall and they exert with small forces on the wall along with pressure exerted by the gain because to sum the whole collision forces and achieve higher pressure and pressure receives greater in the container busts.

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Answer 2

Hey Mate here is your answer

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.

Hope it will help you