Q. 84.5( 27 Votes )
Why is air not felt?
As already mentioned, we are living at the bottom of a sea of air. The atmospheric pressure in the SI units is roughly 100000 newtons/metre2. Now the atmospheric pressure acts on all bodies on the earth's surface. An average-sized person has roughly an area of 2 m2, and so the total thrust acting on our bodies will be about 200000 newton. Yet we don't feel it! This is because the blood and other fluids in our bodies exert pressure slightly greater than the atmospheric pressure and so a balance is obtained. At high altitudes, sometimes, nose bleeding occurs because the atmospheric pressure becomes less than the blood pressure.
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