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
> cabin is sealed
The cabin is not sealed. There is a small vent at the back. You can see it here, with the red border around it: https://i.imgur.com/KYkePn7.jpg
The engines provide fresh air to the cabin (or in the case of the 787, electric compressors). The air pressure inside the aircraft is equal to the pressure at about 8,000 ft. Keeping the pressure lower than ground level puts less stress on the airframe and is less weight in air to carry around.
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