Why do all aircraft windows have a tiny hole in them?(a) to equalise pressure between the two panes of the window.(b) to easily crack the window in case of emergency.(c) for better ventilation in the aircraft.(d) to help in regulating the temperature of the aircraft.

Why do all aircraft windows have a tiny hole in them?(a) to equalise p

1.	Why do all aircraft windows have a tiny hole in them?(a) to equalise pressure between the two panes of the window.(b) to easily crack the window in case of emergency.(c) for better ventilation in the aircraft.(d) to help in regulating the temperature of the aircraft.
Answer» <p>a..Theholeserves as a bleed valve, allowing pressure between the air in the passenger cabin and the air between the outer and middle panes to equilibrate. Thistiny little holeensures that cabin pressure during flight is applied only to the outer pane.</p> <p>thanks</p>