How is Air Pressure and Wind Related?

Air holds water.

On a hot, sticky day, you've probably heard the word "humid". Other words for humid are 'steamy" or 'muggy'. Water in the air is called water vapour (a gas).

Because molecules in warm air are father apart, they can hold more water vapour. Cold air can hold less water vapour. When humidity increases, air pressure decreases. Low air pressure brings wind, storm clouds, and rain. High air pressure will bring cooler temperatures and clear skies.

Relative humidity is how much water vapor is in the air, compared to how much water air could hold at that temperature. It is shown as a f percent. For example, a relative humidity of 75 percent means the air is I holding three quarters of the water vapor it can hold. The highest humidity, right before it rains is 100%.

You will learn more about humidity in Lesson 2.


Wind

Have you ever tried to walk in very breezy weather? It can be difficult! Often, we experience wind, but we do not often think about it until it blows in our faces or causes damage. 


Height Above Sea Level

The pattern of falling and rising air is called a convection cell.  In a convection cell, hot air rises and moves out to sea.  Cool air sinks and moves in to land.  This causes a breeze.
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  Video

Watch this video - Air Masses and Wind.



Air Masses and Wind