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Question

A column of air extending up to height of the atmosphere exists on an area of 100 cm2 exists above our head. Why don't we get crushed?
  1. The pressure inside his body is equal to the atmospheric pressure.
  2. The pressure inside his body is higher than the atmospheric pressure.
  3. His skin is not sensitive enough to feel it.
  4. The pressure inside his body is lower than the atmospheric pressure.


Solution

The correct option is A The pressure inside his body is equal to the atmospheric pressure.
The pressure exerted by the atmosphere near the Earth's surface is called atmospheric pressure. Inside the body, the flowing blood and body fluids create a pressure which counters the effect of atmospheric pressure. We are not crushed because the atmospheric pressure is balanced by the pressure inside our body.

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