Pressure

• What motion are molecules of gas in?

  Constant random motion
• The temperature of the gas is related to the average kinetic energy of the molecules
• How does temperature affect the kinetic energy of molecules?

  The higher the temperature, the greater the average kinetic energy and so the faster the average speed of the molecules
• What happens when molecules collide with the wall of a container?

  They exert a force on the wall.
• What is the total force exerted by all of the molecules inside the container on the wall?

  Gas pressure
• What happens when you change the temperature of a gas?

  When held at a constant volume, changes the pressure exerted by the gas (Pressure Law)