AIRCRAFT PRESSURE

At cruising altitudes of around 35,000 feet, atmospheric pressure (i.e. the pressure outside the aircraft) is about 3.4 pounds per square inch. That’s way too low for bodily functions important at such altitudes, e.g. consciousness; so, inside the cabin,pressure is artificially maintained at roughly 11 pounds per square inch—about what you’d experience at an elevation of 7,000 feet