5.What are the Special Features a small hole in the window on the plane
Technically, you need to know that as the plane fly very high, the air pressure decreases However, When the aircraft is flying high, the air pressure outside the plane is lower than the air pressure inside the plane. Due to the different air pressure inside and outside the aircraft, the windows of the aircraft are under a lot of pressure. Generally, aircraft windows have three parts: The outer, the middle and the inner. The outer part of the aircraft window is the sub-pressure difference between the air pressure inside and outside the aircraft. The small hole in the Centre of the aircraft is part of the balance of air pressure between inside and outside of the aircraft
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