how do passenger airplanes regulate cabin oxygen levels?

Question

Oxygen masks will drop from ceiling during emergencies, how about during regular flights?

In: 9

Answer 1

Airplane cabins are pressurized to the equivalent of 8,000 feet or less by diverting high-pressure air from the jet engines into the cabin, which is a **mostly* airtight pressure vessel. The masks only drop in the event that the cabin pressurization system fails, ~~most likely~~ **possibly* due to a leak in the hull.