Mount Everest Has 21% Oxygen — So Why Is Breathing So Hard?

Did you know that Mount Everest has the same 21% oxygen as sea level? So why is breathing so difficult at extreme altitudes? Discover how atmospheric pressure affects the number of oxygen molecules in every breath. And how can passengers breathe normally inside an airplane at 35,000 feet? Find out in our next video! #MountEverest #Oxygen #Science #Aviation #FrenkyExplains