Question

What causes gas pressure​

Answer 1

Gas pressure is caused when gas particles hit the walls of their container. The more often the particles hit the walls, and the faster they are moving when they do this, the higher the pressure. This is why the pressure in a tyre or balloon goes up when more air is pumped in.

Answer 2

The pressure a gas exerts comes from the motion of its molecules. Gas molecules move about freely, bouncing off container walls and one another. When the molecules bounce off an obstacle, they transfer a small amount of force. The change in direction due to the obstacle results in a change in momentum that pushes on the obstacle.

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