During flight, the outer atmospheric pressure reduces; thus, the aircraft needs to maintain the cabin pressure of oxygen to ensure the safety of passengers and also prevent the absence of oxygen and suffocation. Hence, all the commercial aircraft have pressurized oxygen cabins. This pressurization system of the cabin is created by pumping air inside them. This filling of the air is done by the jet engines. The jet engines consume the air from the atmosphere, and the excess air is transferred into the cabin. The air sucked by the jet engine could be humidified carrying moisture in them or cooled. Then, this humidified or cooled air is circulated throughout the cabin. When the cabin achieves its ideal level of pressure, the jet plane stops sending the air into the cabin, and the aircraft will maintain the level of the pressure in the cabin.
The pressure inside the cabin is maintained by pumping the air inside it. This air or oxygen pumped in the cabin is very crucial for the survival of the passengers traveling and not getting suffocated. The jet engine sucks the air from the atmosphere and transfers the excess air in the cabin area. This oxygen pumping can also be done by the outflow valve. The outflow valve has the specialized function of getting open when the pressure of the cabin exceeds the level required. The excess air will be released out of the cabin area through the outflow valve to maintain the air pressure balance in the cabin of the aircraft. When the pressure reaches the required level, the outflow valve eventually closes.
Importance of Cabin Pressurization:
The aircraft cabin pressure is managed due to the difference in the high altitude and low altitude density of air. The density of air is very low at the higher altitudes in comparison to the low altitudes. Hence, when the aircraft is at the ground level, its cabin air pressure is around 14 psi (pounds per square inch), and when the aircraft flies at around 40,000 feet above sea level, its cabin air pressure reaches 4 to 5 psi. This low pressure of air inside the cabin at high altitudes can cause the restriction of oxygen present in the cabin for the passengers. This will lead to the suffocation of the passengers unless the cabin pressurization system is used to maintain the cabin air pressure and maintain the oxygen level inside the cabin. The low pressure in the cabin indicates the lower density of the air or oxygen in the cabin. The lower oxygen level in the cabin can cause medical conditions like hypoxia. Hence, ultimately, the oxygen level maintained by the cabin pressurization system is very important for the passengers, crew members, and also for the pilot to breathe a sufficient amount of oxygen. Modern-day aircraft also have solutions in the case of cabin pressurization system failure. Nowadays, oxygen masks are available for every passenger in the situation of losing air pressure inside the cabin. These oxygen masks will provide a sufficient amount of oxygen to the passenger until the aircraft lands.
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