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Airplane windows are smaller than bus windows because the cabin where the people sit is pressurized. This pressurization keeps a high enough pressure so that people in the airplane don't need to use oxygen masks. However, this pressurization equals about 9.0 pounds per square inch (PSI). This 9 pounds per square inch is a pressure that pushes outward on all parts of the airplane cabin. On metal this is not a problem, but with windows, made of a material that can be seen through, it's beneficial to keep this pressure low so that the window won't crack. If you think about the average airline window, it's about 120 square inches (a size of about 12 inches by 10 inches), and if each inch has 9 pounds of pressure pushing out on it, that equals (120 x 9 = 1080) 1,080 pounds of pressure on that one window. That's over half a ton! So, with a much larger window, like in a bus, that pressure would be too great and the window would shatter and blow out, making it very drafty inside the airplane! I hope this helps.

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Q: Why are plane windows smaller than bus windows?
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