1 Changes in Energy balance

Geog Wikis > Grade 12 > Climate and Weather > 1 Changes in Energy balance
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The Atmosphere

Definition: The body of air and gas surrounding the Earth.

Barometer and air pressure

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Factors responsible for atmospheric pressure differences

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Global pressure belts

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Origin of high and low pressure cells

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Please note the following YouTube video is for the NORTHERN HEMISPHERE!

The relationship between air pressure and wind

Wind is air in motion. Air moves from HIGH pressure to LOW pressure. The speed and direction of wind is influenced by the following two factors:
Pressure Gradient

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Coriolis Force

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Geostrophic flow

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Surface Air Movement


Advection is the horizontal transfer of air.


Convection refers to air rising vertically in the atmosphere due to heating.

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Geography teacher at heart and author of http://sageography.myschoolstuff.co.za. Account Manager for http://www.campuspress.com. Passionate about South Africa!