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.
Pressurization is required in aircraft that travel above altitudes over 10,000ft.
PRESSURIZATION - Artificially increased pressure in an aircraft to compensate for the reduced external pressure as the aircraft gains altitude.
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It's true that pressurization is perhaps the ultimate luxury in an airplane (once you fly it, you'll never want to go back), but it's not for everyone, either operationally or financially.
Cabin pressurization - A mechanism used to maintain air pressure in an airplane's sealed cabin at a level suitable for passengers.
Number of cycles: Pressurization & flight cycles.
Geometry: Notches and variation in cross section throughout a part lead to stress concentrations where fatigue cracks initiate.
Surface quality.
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, ...
Boeing's Stratoliner introduced pressurization, allowing the type to cruise above most of the weather. TWA and Pan Am were the main airline users.
In a two-stroke engine, on the other hand, the crankcase is serving as a pressurization chamber to force air/fuel into the cylinder, so it can't hold a thick oil.
 See also: Aircraft, Aviation, Navigation, Flight, Power
  
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