Small Hole in Aircraft Window

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For those of you who have ever been on a plane and often gazing out at the window means you will see a small hole fixed in the window of the plane. Well now do you know what exactly is the function of the window hole? Maybe you think that the window hole is just a decoration, but actually there is a function behind the small hole.

The hole allows air to move between the cabin and the area between two panels, so the pressure in the two areas is the same.