How high can airplanes go? Or how much the plane goes over?

How high can airplanes go? Or how much the plane goes over?

Airplanes can fly very high, but there is a limit. Because at higher altitudes, the oxygen content in the air decreases, and in that case, the plane can burn fuel easily. 

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And if the engine of an aircraft is made to fly very high, it only flies well at high altitudes, problems arise in those planes when flying at a relatively low altitude. Passenger planes usually fly 30,000 to 45,000 feet above, which is equal to or one and a half times the height of Mount Everest, the world's highest mountain. A rocket can go much higher because it has its own oxygen system that it burns. But airplanes use air oxygen, so they cannot fly very high. 

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There is another problem with flying too high. The higher the plane rises, the lower the air pressure inside it. It turns out that the air pressure we are used to at the surface (standard air pressure) is cut in half at just 18,000 feet. Passengers feel uncomfortable when the pressure drops. So the pressure inside the plane is increased. It would be best if it could be equalized to standard air pressure. But that is not possible, because then the structure of the plane would be too stiff and heavy to bear its cost. Modern commercial aircraft, therefore, take a middle ground. The internal pressure of these aircraft is kept equal to air pressure at altitudes of 5,000 to 8,000 feet. 

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It reduces the discomfort of the passengers even if they fly higher. Of course, there is a condition of locking the ears during take-off and landing. This is because the air trapped inside the ear during this time is affected by the difference in air pressure between the surface and the controlled pressure inside the aircraft.

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