Why is there a HOLE in AIRPLANE windows?
- Published on Oct 29, 2016
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After take-off and during climb, the outside air pressure is in a constant fall, whilst the air pressure within the cabin is in a constant rise created by the aircraft's bleed and air conditioning system, otherwise you would have trouble breathing during the flight. Due to the big difference between the ambient pressure in the cabin and the low pressure outside, there´s is a lot of physical stress on the cabin hull and especially on the windows.
Now if we take a closer look at the cabin windows you´ll see they are made up out of three separate window panes. One outer and middle pane which share the same window frame and one inner pane.
Now if you look at your windows installed in your home you´ll see they are also made up out of at least two panes of glass, with a transparent gas in between them, acting as a temperature barrier which stops condensation on the inner side of the window.
Same in the airplane but without the special gas in between. Because the air pressure difference and temperature variations are far much higher then in your home, engineers had to come up with and idea to prevent the windows from fogging and freezing up. So they´ve decided to leave an air gap in between the two panes. But air has the physical effect of expanding and shrinking either due to air pressure or temperature changes, which could damage the windows.
See the rest of the video for more information!
- Science & Technology