Question

10.7 Look at the figure below and answer the following questions.
(a) Arrange the points A, B, and in the
ascending order of pressure at their
location.

(b) Why does pressure change as we move up
the layers of the atmosphere?
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Answer 1

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=> The weight of the atmosphere acts as a force upon the underlying surface of the Earth. The amount of force exerted over an area of surface is called atmospheric pressure or air pressure. In the atmosphere, the air pressure at any point is caused by the weight per area of the air above that point. As we go up the layers of the atmosphere, fewer air molecules are above us. So, there will be less weight of air above us. Hence, atmospheric pressure always decreases as we move upward in the atmosphere.