1. Pressure

2. Pressure is the amount of force per unit of area.

4. When a force is working on a small area it exerts a large pressure.

5. (Atmospheric Pressure)is caused by the weight of air.
Air Pressure
(Atmospheric Pressure)is caused by the weight of air.

6. Barometer is used to measure pressure.
Normal atmospheric pressure supports 76cm of mercury in a barometer
Atmospheric pressure is not constant and changes according to temperature and moisture in the atmosphere

8. Demonstrating Atmospheric Pressure

9. Isobars are pressure lines on a map.
High Air Pressure is associated with clear skies and good weather.
Low air pressure is associated with cloudy/wet weather.

10. Pressure in a liquid increases with depth

11. Pressure in a liquid increases with depth