Cabin pressurization is the active pumping of compressed air into an aircraft cabin when flying at altitude to maintain a safe and comfortable environment for crew and passengers in the low outside atmospheric pressure.
Cabin pressurization - A mechanism used to maintain air pressure in an airplane's sealed cabin at a level suitable for passengers.
Cabin Pressurization is the act of pumping compressed air into the cockpit and cabin of the aircraft to ensure that the crew and passengers do not pass out from lack of oxygen, a problem known as hypoxia.
ABSOLUTE CEILING - A less often used term - the highest altitude an airplane can sustain level flight, or altitude above which the cabin pressurization system can no longer maintain a sufficient oxygen level for passengers and crew, ...
 See also: Cabin, Altitude, Range, Power, Plane
  
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