Pressure = Force / Area
A high pressure area is essentially a location where there is high force over a certain area. The pressure essentially is pushing all matter away from it, much the same way as if you were to drop a book, there would be a rush of air out from under it as it fell. The books fall is compressing the air directly below it (high pressure) and as a result the air moves away from the compression into the surrounding low pressure areas. The larger the volume of air being compressed the longer it takes for the air to evacuate the area – resulting in prevailing winds in the atmosphere.
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