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Air pressure in a airplane

Updated: 9/15/2023
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As an airplane climbs higher in the atmosphere, air pressure, both outside and inside an unpressurized airplane, decreases. Reduced air pressure causes less oxygen to be forced through membranes in the lungs and into the blood stream of crew and passengers, resulting in oxygen deprivation or "hypoxia". Use of a higher concentration of oxygen can counter act this effect to an altitude where use of even 100% oxygen will not provide enough oxygen to pass into the blood stream. Use of a pressurized mask or cabin pressurization is required.

Pressurized aircraft pump outside air into the cabin by use of a turbocharger or supercharger in piston powered airplanes or by directing compressed air from the front, compressor stage, of a turbine (jet) engine. An outflow valve constricts the flow of air escaping from the cabin, resulting in a higher cabin air pressure. On commercial jets, the cabin is generally restricted to a pressure that equates to an altitude of 8,000 feet above sea level, or lower, while at cruise altitude.

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Related questions

Is the air pressure in a flying airplane greater that outside the flying airplane?

In a commercial airliner flying at cruising altitude, the air pressure inside the airplane is considerably higher than the air pressure outside. The air pressure outside is too low for people to breathe comfortably, so the interior is pressurized.


What defines low air pressure and where is low air pressure typically found?

There is low air pressure usually when you are up in a mountain or in an airplane like when your ears pop after you get in an airplane and you are at high altitude your ears do this because the pressure inside your ears and the pressure in the air is not the same. When there low air pressure the air is less dense.


What happens when your airplane takes off from an airstrip on the ground and rises 30000 feet into the sky what happens to the air pressure on the outside of the airplane?

Atmospheric pressure is caused by the weight of air above the measurement point. At 30,000 feet in the sky, the air pressure on the outside of the airplane will be much lower than it was nearer the ground.


Why does a bottle get crumpled up while in an airplane?

it is air pressure


When you are landing in an airplane does the air pressure increase or decrease?

It increases. In an unpressurized airplane, the pressure increases because the air is denser at lower altitudes. In a pressurized airplane, the pressure increases both because the pressure must be equalized before the doors can open and because the hull is not designed to withstand an outside pressure higher than the inside pressure.


What happens when air above an airplane wing is moving faster than air below an airplane wing?

From Bernoulli's theorem this results in the air above the wing to form a low pressure compared to the air beneath the wing. High pressure moves to low pressure so you get lift


What type of air is above an airplane wing when it is flying?

The air above an airplane wing in flight is at lower pressure than the air below the wing. Hope this helps.


What are the forces that act an airplane in flighht?

Gravity , wind and air pressure.


What makes an airplane lift up into the air?

The air under the plane's wings exerts pressure.


If there is a bag of chips on airplane why does it puff up while in flight?

Air pressure.


How is air related to flight?

You can't fly in a vacuum! Air pressure is what keeps an airplane or a bird in flight.


Why do airplane need air pressure?

the planes don't need air pressure, the humans inside need oxygen to breath and the air gets thinner the higher you go