February 2025

Pressure systems

By |2025-02-12T09:10:04+02:00February 12th, 2025|O Level Geography, Weather and Climate|

The world's pressure belts 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 […]
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Pressure

By |2025-02-12T09:09:34+02:00February 12th, 2025|O Level Geography, Weather and Climate|

An aneroid barometer. Image imgkid. An aneroid barometer. Image imgkid. ZIMSEC O Level Geography Notes: Pressure.

-is the pressure exerted by the weight of air in the atmosphere of Earth. It is measured in millibars. It is measured using an instrument known as a barometer. There are two different types of […]

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The concept of pressure

By |2025-02-12T08:59:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

 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 […]
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Pressure in liquids and the manometer

By |2025-02-12T09:01:22+02:00February 12th, 2025|Notes, O Level Science Notes, Ordinary Level Notes|

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 […]
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