Last week: What is the purpose of the hole in airplane windows?
This question came to me after consultant Veronica stumbled across an article detailing this small opening that has intrigued many a traveler. Maybe you have seen it as you are looking on to the city below, or maybe you noticed frost forming on just that part of your window, either way I needed to know just what it was for. This is what I learned:
Each window on an airplane is made of 3 acrylic panes. The innermost known as the scratch pane, the middle pane which contains the hole and the outer pane. As planes take off and land the pressure in both the cabin and outside the plane changes. While the inside is regulated the outside is obviously not. The outer two contain the difference in pressure between inside the plane and the outside. The middle and outer panes are strong enough to withstand the difference on their own and the outer pane bears the pressure because of the breather hole. In the event that the outer pane fails the outer pane is there to take over. Now as for the frost we often see there is a story there too. While flying temperatures outside the plane can fall to as low as negative 70 degrees fahrenheit. The condensation comes from the air from the inside cabin meeting the cold of the window pane. So now the next time you get the coveted window seat you can sit back, remember my wonderful blog and maybe share your new knowledge with your seatmate.
This Week: What percentage of Americans have been on a cruise at least once?