What is atmospheric pressure?
Atmospheric pressure is the weight of atmospheric components such as air, dust particle, and water vapor at a particular location at a particular time per square centimeter.
Atmospheric temperature is measured by Barometer and it is shown in millibar.
As we know, atmospheric pressure at sea level is 1013.23 millibar which is equivalent to a weight of 1.033 Kg per square centimeter. Considering the area of the upper surface of the human head is 15 square centimeters.
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| Overhead atmospheric pressure |
There are two question arises here:
First, In the open atmosphere at sea level, there should have a feeling of 15.5 Kg of weight at our head.
Second, in the room, there should not be any atmospheric pressure at our head, as a roof would have carried all the atmospheric pressure.
But we neither feel any atmospheric pressure in an open environment nor feel relief inside the room. Because of the following reasons:
- Atmospheric pressure does not only press vertically but also from both sides. Thus we do not feel vertical weight or upliftment and also do not get relief of atmospheric pressure inside the room. we get equal atmospheric pressure inside the room and in the open environment.
- There is full of air inside our body, so the air inside the body such as lungs, stomach, etc created the same pressure in the opposite direction of atmospheric pressure both vertically and horizontally, hence we do not feel the weight of atmospheric pressure at overhead.
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