So, when the cabin is sealed, the interior pressure is equal to the atmospheric pressure at sea level. When the plane lands, the exterior pressure is equal to the interior pressure. So why does the plane need to be pressurised for the duration of the trip?
In: Engineering
For the same reason that a bouncy castle has a blower constantly pushing air in, rather than being inflated once and left alone: its *way* easier to make something that is only mostly airtight, and then little leaks aren’t a problem.
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