Question

Pressure exerted on the walls of a container by a gas is due to

Answer 1

it is due to the molecules of gasses are free to move here and there so they exert a force in the container

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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.