Airplanes are pressurized for the comfort and safety of the passengers and flight crew. Generally, the air pressure in the cabin is equivalent to around 3000 ft (915 m), which is a pressure of 686 torr, about 90% of that at sea level. A pressurization equivalent to 8000 ft (2500 m) would still be safe, with a pressure of 570 torr, about 74% of that at sea level. What would happen to the passengers if the aircraft was not pressurized and flew at 30,000 ft (9150 m)?
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