How do we breathe on commercial airplanes? If humans breathe out carbon dioxide then shouldn’t we run out of breathable oxygen at some point?

Question

Might be a silly question, but I’ve always wondered how this works.

In: Other

Answer 1

Pressurized cabins have electronic systems in place to regulate breathable air. The co2 is moved out of the pressurized cabin by the use of an outflow valve and fans, which are electronically controlled, while breathable air is pumped into the cabin through a series of devices that cool the air and regulate oxygen levels within the cabin.