January 2023
An aneroid barometer. Image 
The concept of pressure
ZIMSEC O Level Combined Science Notes: The concept of pressure
- Pressure is the force acting over an area
- In such pressure is usually the force per unit area exerted by a fluid/gas
- over a surface with which it is in contact
- \text{Pressure=} \dfrac{Force}{Area}
- If a big force is exerted over a small area it results high pressure
- An example […]
Pressure in liquids and the manometer
ZIMSEC O Level Combined Science Notes: Pressure in liquids and the manometer
- Gravity pulls a liquid down into its container
- The liquid in turn exerts a pressure on the container
- The pressure of a liquid at a certain depth is equal in all directions
- The pressure of a liquid in a container increases with depth
- This means in a container […]
Pressure systems
The world’s pressure belts and winds ZIMSEC O Level Geography Notes: Pressure
Pressure
- Air has weight and therefore exerts pressure, called atmospheric pressure onto the earth’s surface.
- The pressure is not the same for all regions nor is it the same for any one region all the time that […]