Question

A gas exerts pressure on the walls of the container?why?how?

Answer 1

because gases do not have definite shape and volume. It takes the shape and the volume of the container they are poured in. Gases constantly expand due to inter atomic collisions, that is how they move far from each other

Answer 2

Because in the gaseous state, the particles move about randomly at high speed. Due to this random movement, the particles hit each other and also the walls of the container. The pressure exerted by the gas is because of this force exerted by gas particles per unit area on the walls of the container.