Question

Why does a gas exerts pressures on the walls of the container?

Answer 1

As particles of gas are constantly moving so they hit the walls of the container and exert pressure

Answer 2

hii..

The particles in gases are loosely packed and have high kinetic energy and due to this they move with a high speed in random direction due to this random motion of the particle they hit the walls of the container an thus, exert pressure...

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hope this helps !