Well a simple answer would be that if a plane is not pressurized, on high altitudes or just very high in the sky, the plane will expand like a balloon and if it expands to much, big problems happen and I don't really know how it is pressurized but the air inside the plane is usually very different than the air outside the plane, at high altitudes.
When flying at hight altitudes (+12,000FT) planes pressurize the cabin so passengers can stay conscious without wearing oxygen masks.
pressure..!
Why shouldn't technician use oxygen or compressed air to pressurize appliances to check for lea
yes
Yes, it can.
Modern jet airplanes fly at high altitudes, where there is less air and therefore less oxygen. Aircraft cabins are pressurized so that pilots and passengers can have enough oxygen to breathe. There is a high air pressure inside the cabin because outside air (and oxygen) is forced into the cabin by the engines in order to pressurize the inside of the airplane, and this gives people enough oxygen to breathe. This is only possible because the airplane is sealed; if the windows and doors were open, the engines wouldn't be able to pressurize the cabin.
All gliders are airplanes, but not all airplanes are gliders.
Yes, jets really are airplanes but they are faster airplanes.
airplanes are cool
Yes, jets are airplanes but they are called supersonic airplanes.
Yes, airplanes are aircraft. However, not all aircraft are airplanes. Helicopters, blimps, and balloons are aircraft- but they are not airplanes. Airplanes are generally fixed wing machines that move through the air.
No, there were no airplanes in the Victorian era.