In modern commercial airlines, a series of vented rotors are present behind the large fans of the engine. The cabin is pressurized using vents in the engine of an airplane. These outflow valves are usually found in the aft section of the plane, which opens and closes according to the altitude level maintaining constant air pressure inside the cabin. Editorial Team Outflow Valve and Pressure Relief Valve on a Boeing 737-800 To avoid dangers associated with sudden changes in altitude, every plane has a pressurized system that replaces interior air with the air outside the cabin. Most airlines are pressurized to maintain consistent air pressure between 11 psi and 12 psi. In simple words, an average human will lose consciousness within minutes if the cabin is not pressurized. To better understand why airlines need to pressurize their cabins, it is important to clarify the air pressure once the airplane is at a cruising altitude of more than 30,000 feet.Īt 35,000 feet, the air pressure is only about 4 pounds per square inch compared to 14.7 pounds per square inch. What Pressure Are Airplanes Pressurized To In addition, the pressurization helps deal with the effects of rapid changes in altitudes during landing and the takeoff. In a nutshell, airplane cabins are pressurized to maintain the air pressure inside the cabin, which should be comfortable for passengers. To avoid this condition, airplane cabins slowly and gradually depressurize and pressurize the cabin on landing and takeoff. The latter is a condition known to scuba divers who rise too quick from deep water. The sudden change in pressure, if an airplane descends or ascends too rapidly, can also cause the loss of subconscious due to the excess nitrogen coming out of the bloodstream. The lack of oxygen at higher levels can cause slower thinking, dimmed vision, and death. As the altitude rises, humans start feeling the impact of less oxygen leading to nausea, vomiting, and the feeling of breathlessness. In fact, the lack of oxygen and thin air starts to take its toll when we are going uphill or we’are driving up the mountain. For instance, at 18,000 feet, the air pressure is almost half compared to the air pressure at the ground. The air pressure is about 14.7 pounds per square inch and everyone gets an appropriate amount of oxygen.Īs we go higher, the air pressure decreases and we also get less oxygen as a result. On the ground level, the air we breath is perfectly suited to the human body. At these high altitudes, the air pressure is greatly reduced compared to levels on the ground that we’re used to. Most commercial jets and private jets fly at an altitude between 30,000 feet and 40,000 feet. Editorial Team An empty bottle, sealed at 37,000ft, is crushed on descent to sea level, compared with one in its original state. Airplane cabins are pressurized to maintain the air pressure inside the cabin, so that passengers are able to breathe. The airplane cabin is pressurized to maintain the air pressure at sea levels because if the cabin is not pressurized, passengers will get sick, lose consciousness, and possibly die.
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