Question

Gas exerts pressure on walls of the container. Why?

Want answer in a simple language but need a proper explanation.

It's from IX class NCERT book.

Thanks.

Answer 1

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.

Answer 2

<>The particles of gas move freely and move in all directions possible.

<> As a result , they hit the boundaries of the container and thus ,exert the force on its wall.