why airplanes have pressurised cabins for passengers satisfy while flying high in the atmosphere. with reason
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he air pressure in an aircraft(cabin pressure) is kept higher than the atmospheric pressure at high altitudes to avoid discomfort to passengers due to low outside air pressure. This process is called cabin pressurization. Air pressure within the aircraft is called cabin pressure. Low air pressure can lead to a variety of physiological problems like hypoxia, altitude sickness and barotrauma.
Cabin altitude is the equivalent altitude having the same atmospheric pressure as the cabin pressure. When on ground, the cabin altitude is equal to the altitude of the airport. On takeoff, the cabin pressure starts decreasing. To compensate it, air is generally bled in from the gas turbine engines in the compressor stage. This air is cooled, humidified, and mixed with recirculated air if necessary, before it is distributed to the cabin by one or more environmental control systems. The cabin altitude increases to a maximum of 8000feet(2400m). Remember, an increase in cabin altitude is actually a decrease in the cabin pressure.
You may be curious as to why the cabin altitude is not always zero, which is the most comfortable for humans. It is not kept at zero keeping in mind the design limits of the fuselage, since it would create a larger pressure difference between the internal and external surfaces of the aircraft.
The cabin is not de-pressurized on landing. It is actually pressurized to match the atmospheric pressure at the airport.
Yes, passengers feel the difference when an airplane takes off or lands, because the cabin pressure is falling. Even though today’s aircrafts are pressurized so that changes in air pressure are minimized, many air travellers still suffer from airplane ears (barotitis media), which causes partial hearing loss, ear pain, and a stuffed-up feeling in the ears.
Cabin altitude is the equivalent altitude having the same atmospheric pressure as the cabin pressure. When on ground, the cabin altitude is equal to the altitude of the airport. On takeoff, the cabin pressure starts decreasing. To compensate it, air is generally bled in from the gas turbine engines in the compressor stage. This air is cooled, humidified, and mixed with recirculated air if necessary, before it is distributed to the cabin by one or more environmental control systems. The cabin altitude increases to a maximum of 8000feet(2400m). Remember, an increase in cabin altitude is actually a decrease in the cabin pressure.
You may be curious as to why the cabin altitude is not always zero, which is the most comfortable for humans. It is not kept at zero keeping in mind the design limits of the fuselage, since it would create a larger pressure difference between the internal and external surfaces of the aircraft.
The cabin is not de-pressurized on landing. It is actually pressurized to match the atmospheric pressure at the airport.
Yes, passengers feel the difference when an airplane takes off or lands, because the cabin pressure is falling. Even though today’s aircrafts are pressurized so that changes in air pressure are minimized, many air travellers still suffer from airplane ears (barotitis media), which causes partial hearing loss, ear pain, and a stuffed-up feeling in the ears.
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It is done to maintain surrounding pressure equalant to body pressure and keep all safe.
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