Have you ever noticed that windows on airplanes are round rather than square? The distinctive circular shape of airplane windows differs from that of square windows found in vehicles and homes for a very important safety-related purpose.
Square-shaped windows were popular in the 1950s, and they were functional at lower altitudes and slower velocities. But as aviation technology developed, planes began to fly faster and higher, which greatly raised the cabin pressure.
There were disastrous results from this move. Three plane crashes happened in 1953 and 1954 as a result of the square windows cracking from the increasing pressure. Aviation specialists altered airplane windows to be spherical in order to address this safety concern.
Round windows ensure a more stable flight and less chance of cracking since they distribute pressure more evenly. These windows also have a little opening at the bottom called a bleed hole that helps equalize the pressure differences between the air inside the cabin and outside. In addition to keeping moisture out, this aperture guarantees that passengers can see outside clearly.
