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  • Smart Learning for All

  • Topic: Atmospheric Pressure.

  • Why don't we get crushed by atmospheric pressure?

  • Hey.

  • Did you hear that?

  • His ears popped.

  • Is this related to atmospheric pressure?

  • Yes.

  • We know that our earth is surrounded by a layer of air called the atmosphere.

  • The gravitational force of earth constantly pulls this atmosphere towards itself.

  • Due to this, the atmosphere exerts a pressure on the surface of the earth.

  • As well as on the objects present on its surface.

  • This pressure exerted by the atmosphere is called the atmospheric pressure.

  • This atmospheric pressure outside our body is balanced by the air pressure present inside our body.

  • When the atmospheric pressure decreases, it becomes less than the air pressure inside us.

  • Now, to balance the pressure inside and outside our ears, the air present inside rushes out.

  • Whereas, when the atmospheric pressure increases, it becomes more than the air pressure inside us.

  • So, to balance the pressure inside and outside our ears, the outside air rushes in.

  • This movement of air results in that sudden pop.

  • Have you noticed this before?

  • Has your water bottle ever got crushed once your airplane landed?

  • This happens because of changes in the atmospheric pressure.

  • Generally, the atmospheric pressure in the bottle is equal to that on the surface of the earth.

  • Whereas, in an airplane the atmospheric pressure is low as compared to that on the surface of the earth.

  • During the flight, when you open the bottle and drink some water in the airplane.

  • The atmospheric pressure in the bottle becomes low.

  • This is because.

  • The low pressure air present in the airplane occupies the place of water which you just drank.

  • However, when the airplane lands and you come out of the plane, the pressure outside the bottle.

  • The atmospheric pressure on the surface of earth is high as compared to the pressure inside the bottle.

  • Hence, the outside air exerts a greater pressure on the surface of the bottle than the inside air.

  • As a result, the bottle gets crushed.

  • Wow.

  • How is he able to lift such a heavy car?

  • Are we also powerful enough to handle such a huge amount of pressure?

  • Yes, to some extent we are also carrying a huge amount of pressure.

  • At sea level, the atmospheric pressure is about 14.7 psi.

  • This means that the atmosphere is exerting 14.7 pounds of force on every square inch of our body.

  • Which is really huge.

  • So, why don't we feel this immense pressure?

  • This is because various parts of our body such as ears, nose, lungs and stomach also contain air.

  • Which exerts pressure on the atmosphere which is equal to the atmospheric pressure.

  • In this way.

  • The atmospheric pressure and the air pressure present inside our body cancel each other.

  • As a result, we don't get crushed by the atmospheric pressure.

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