Gas Pressure

Gas Pressure

1. Gas pressure is the force per unit area exerted by the gas molecules as they collide with the surface of an object.
2. In SPM, especially in paper 2 essay question, you need to know how the gas pressure is produced. (See question below)

Question:
Explain how gas pressure is produced in a closed container?

Answer:

1. Gas molecules in a container are in constant and random motion.
2. As a result, the gas molecules collide on the wall of the container.
3. After colliding on the wall, the gas molecules bounce off, and the direction change creating a change of momentum to the molecule of the gas.
4. The change of momentum produces a force on the wall.
5. The force per unit area is the pressure on the wall.