Thrust exerted by atmospheric air on a unit area of earth's surface is called atmospheric pressure.
The weight of air column present in the atmosphere exerts a thrust on the earth surface. The thrust exerted on a unit area of the earth surface is called the atmospheric pressure.
(a) What is meant by atmospheric pressure? What is the cause of atmospheric pressure?
(b) Why are our bodies not crushed by the large pressure exerted by the atmosphere?
(c) Explain why, atmospheric pressure decreases as we go higher up above the earth's surface.