Airplanes pressurize their cabins by pumping air into them. As their jet engines suck in air, some of the excess air is diverted into the airplane's cabin. The air is both cooled and humidified — meaning moisture is added to it — after which it's circulated into and throughout the cabin.

What are the 3 types of pressurization in an aircraft?

Ambient pressure: the pressure in the area immediately surrounding the aircraft. Cabin altitude: cabin pressure in terms of equivalent altitude above sea level. Differential pressure: the difference in pressure between the pressure acting on one side of a wall and the pressure acting on the other side of the wall.

What is aircraft pressurization systems?

Definition. A system which ensures the comfort and safety of crew and passengers by controlling the cabin pressure and the exchange of air from the inside of the aircraft to the outside.