What is that little hole on airplane windows near the bottom?

Question

And is it actually a hole that goes through from inside to outside?

Answer 1

It is to stop the windows steaming up, which would stop you being able to see out.

Answer 2

And to answer the second part of your question, no it doesn't go all the way through to the outside. It is just on the inner "pane". Not that a hole that small would cause a decompression, but maybe if each hole in every window did go the outside...nah probably still not big enough if they were all added up.

Answer 3

To equalize the pressure between the inside and outside windows. Without that little hole to relieve the pressure the outside window would pop out.

Answer 4

The hole is through the plexiglass which acts as a protector for the real window, which is tempered glass and very thick
If there were no hole there, condensation would build up on the glass plate and :
a) you couldn't see out
b) condensate would accelerate corrsion around the glass frame
c) the plexiglass would bulge out and concave each time the aircraft climbed or descended

Answer 5

If you noticed, the windows are double glazed. This would mean that the air inside is subject to compression and expansion, so the little hole allows the pressure to equalise on both sides, thus preventing the window from exploding or imploding

Answer 6

Because airplanes' cabin pressure always changes, you need a little hole so the air can escape/enter the space between the plexiglass protector and the real glass window. (Or else the plexiglass would flex around, and that would be annoying- it probably won't explode)
Also, the little hole would help remove moisture from the space between the plexiglass and glass window.

Answer 7

The reason why there is a hole on the inner (plastic) window is because the cabin is presssurized in flight. If the hole wasn't there the plastic inner window would bust.

Answer 8

Vents to allow air to move between the inside and outside glass to keep the windows from fogging or frosting.

Answer 9

the window is consisted of two plates of plexiglass
1- the outer one, which are exposed to pressure changes and other climatic conditions; is the strongest one
2- inner - to avoid from the passengers to touch a freezing window at -40 C degrees.
The hole provides a pressure balancing in the space between windows, avoiding the creation of pressure in that space.

Answer 10

that's thoroughly diverse! Outflow vavle are hidden away and they administration pressurisation. The small hollow enables any moisture in the air to be absorbed. If it wasn't there, the living house windows ought to steam up like a motor vehicle, and thanks to low temperatures airborne, it ought to freeze!

Answer 11

It is there to prevent the buildup of condensation between the two pieces of plastic that make up the windows.