why don't we feel the atmospheric pressure on our body?

because the pressure exerted by our body and the air pressure is balanced
 
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The feeling of pressure on the body is the sensation of a net pressure. That is, you feel the difference between the pressure outside of the body and the pressure inside the body. These pressures are the same so there is no net pressure difference.

However, if you were scuba diving on air to its maximum safe depth, you might notice that the viscosity of the air that you inhale is greater than the viscosity at sea level. The increase in viscosity does not depend on the net pressure difference; it only depends on the pressure.
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The reason is our blood also exerts pressure called blood pressure 
its equal to or greater than atmospheric pressure 
so we don't feel any pressure 
in cold climates our blood pressure is so much greater than atmospheric pressure 
so at these times we get bleeding from nose , gums etc.......
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we don't feel atmospheric pressure because the same amount of blood pressure is released by our body which maintains the balance. if we travel to any high hill station you will often feel nose or ear bleeding because the balance is disturbed. the atmospheric pressure is decreased and the blood pressure is the same as the earlier.
thumbs up please.....
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We don't feel atmospheric pressure because our blood  also exert the same amount of pressure.The pressure exerted by the blood is called counter pressure.So both these pressures get cancelled,hence we don't feel the atmospheric pressure.But when we go to hill stations the atmospheric pressure is low,so our blood vessels burst due to high pressure and we face nose bleeding,ear bleeding,head ache etc.
Thats why the astronaut wear special suits while going outer space
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