Question

eaplain the following 1.gases exert pressure on the wall of the container

Answer 1

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.I hope it will help you.

Answer 2

you can prove it by this activity

take a balloon and fill up it by the air the ballon gets bigger and bigger which is depend on the amount of ait pumped in it if you fill more air then the ballon get brust in this activity the air makes a pressure which makes the force on the wall of ballon...

hope you understand

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