When one of the molecular bullets hits the wall of a container it exerts a force on the wall – exactly as a ball thrown at an open door exerts a force and will slightly move it. All the rebounds of the molecules add together and make up the pressure of the gas. This is when a human body exhaled smoke towards a wall.
If a molecular hits the wall, there will be a force to prevent its previous moving, but if the molecular hits another molecular which is the same as itself, these tow molecular will become a bigger one. This like people who share same interests and benefit in common are inclined to come together, and we always try to put same categories products together.
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