Here is why there is a Tiny Hole in Airplane Windows
Airplane windows consist of three separate panes. The ""bleed hole"" allows pressure to balance between the passenger cabin and the air gap. Meaning the outer pane takes on the pressure while the middle pane acts as a fail-safe. The inner pane is ""non-structural"" but it helps protect the middle and outer panes from damage caused by passengers. The ""bleed hole"" also releases moisture from the air gap. This prevents the window from fogging up or frosting over.
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