why do air planes have that little hole at the bottom of the window
there are three parts most airline windows. first is the inner layer
which is the dust or scratch cover. It keeps people from poking scratching the real
window. Behind that are two other panes that make up the main part of the window.
They're two, half-inch thick pieces of plexiglass and they're separated by about a
half an inch of air. The middle pane has that hole. It's sometimes called the
breather hole. There are two purposes for the whole. One, the whole let's warm air
in between the 2 panes keeping the outer window from getting frosted or fogged up from
the really cool air outside. 2 when the plane ascends and descends the air pressure on
the window changes. That little breather hole keeps the pressure inside those two
panes the same so they don't
implode or explode that's what the hole is for!