Have you ever wondered when you are flying in an airplane, why are its windows shaped like a rectangle with curved corners, and why is there a small hole below those windows?The adoption of airplanes for square-angled windows may fall, as was the case with the first jetliner in the early 1950s. Investigations have shown that the crash was caused by the corners of the square windows, according to Mentalfloss.
If the square-angled windows are adopted, this will increase pressure in the passenger compartment, while the oval-shaped windows are able to distribute the pressure in a balanced manner.
For the small opening under the windows of the aircraft, it is of great benefit according to the site of Travelandleisure, ensuring that passengers get the best position to breathe, by balancing pressure outside and inside the aircraft, while maintaining pressure increase abroad, which ensures the renewal of air inside the cabin, With good oxygen content.
The small hole in the windows also prevents moisture from forming "fog", giving travelers a better view of their travel.