When wind speeds up as it blows over the top of a hill, atmospheric pressure there increases.
- Atmospheric pressure is defined as the force per unit area exerted against a surface by the weight of the air molecules above the earth surface.
- The atmospheric pressure is not distributed uniformly over the earth. The amount of pressure increases or decreases, according to the amount of molecules, that exerts the force on the surface.
- When temperature of the air increases, the air expands and reduces the number of molecules over the unit area. It leads to reduction in pressure.
- Similarly, when the temperature falls, the air contracts and the pressure increase. Therefore, the temperature and atmospheric pressure are inversely related.
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