Respuesta :
Answer:
Because pressure change according heights.
Explanation:
So, human begins need several variable to exist and pressure is one of them, we need to have a exact amount of pressure to can stand, jump, even breath. So, when you go up, you change your distance from Earth surface and the result is that your are introducing yourself into a different pressure environment that could bring you problems.
So, in order to that not happen, pressure must be change.
These changes in pressure are necessary because air pressure inside the airplane should match the air pressure outside the plane.
What is air pressure in a plane?
The air around us has weight, and it presses against everything it touches. Thus, air pressure is the reason airplanes are able to produce lift. It is because of the shape of an airplane wing, that air on top of the wings moves faster than air on the bottom of the wings.
As a flight climbs after takeoff, the air pressure in the cabin decreases. As a result, the cabin air expands by about 30%. When the flight lands, the volume of the air contracts again.
Why are the changes in the pressure necessary?
The changes in the pressure are necessary because in higher elevation, there is the presence of lesser molecules when compared to lower levels.
Also, the majority of the molecules or atmosphere are held close to the surface of the Earth. So it leads to the decline in air pressure briskly at the initial stage, and then more gradually at the higher levels.
However, if the pressure in an airplane cabin does not change, then it may cause harm or injury to the passengers and then at the height of 8000 meters, there will be a requirement of oxygen equipment.
Hence, the answer was given and explained above.
To learn more about Air pressure in a plane here:
https://brainly.com/question/12942023
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