What is wind and pressure in detail
How is wind created?
There is air all around us. Usually we don't even notice it, because air is invisible and you can't touch it either. But whenever larger air masses are in motion, we can feel them: That is when wind arises.
Air movement has something to do with different temperatures: The sun's rays heat the earth. In doing so, it encounters both water and land. As a result, the land warms up faster than the water - with far-reaching consequences: The heating expands the air over the mainland, becomes lighter and rises. Cooler air masses from the sea flow in. This is how wind is created!
This flow is also called circulation. The word comes from Latin and means something like "circular or spiral movement".
Warm, rising air exerts less pressure on the earth than cold, falling air. This means that where warm air rises, there is one Low pressure area. Where cold air sinks, there is one High pressure area. Air always moves where the pressure is low to equalize it. You could say that the warm air sucks the cold air behind it. It flows from the high pressure area to the low pressure area.
There is circulation not only in smaller areas, but also "on a large scale" around the globe. At the equator, the sun warms the air more than in other regions. The warm air rises and flows towards the poles, where the air is particularly cold. Part of the flowing warm air sinks in between and flows back to the equator, part is deflected by the rotation of the earth and part reaches the poles and then flows back to the equator. This is how the big winds arise, such as the trade winds or the westerly winds, which constantly circulate around the globe.
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