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 Pressure gradient force - Definition 

The pressure gradient force is the force that is usually responsible for accelerating a parcel of air from a high atmospheric pressure region to a low pressure region, resulting in wind.

The pressure gradient force acts at right angles to isobars in the direction from high to low pressure. The greater the pressure difference over a horizontal distance, the greater the force and hence the stronger the wind.

However the pressure gradient force is not the only force that acts on a moving parcel of air — if it were, then eventually the low and high pressure regions would disappear. The second force acting on a moving parcel of air is the Coriolis force.


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This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Pressure gradient force".