How Can You Breathe On An Airplane?

Oxygen is sparse at high altitudes but flying in a plane couldn't be more comfortable. Where do planes get their oxygen? Sign Up For The TestTube Newsletter Here ▻▻▻▻ http://bit.ly/1myX...

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Flying at 30,000 feet you're higher than Mount Everest, a place where you need an oxygen tank to breath. So, why don’t you need one flying from New York to LA? Trace here for DNews my frequently flying friends. As you go up higher and higher, the air pressure gets lower. The ratio of oxygen in the atmosphere stays the same, but because of the lower pressure, the oxygen molecules are spread out. Thus, at over 18000 feet (5.5km), there is less than half the oxygen available sea level. Once you're over 25,000 (7km), comfortingly called the "Death Zone," by National Geographic, plants no longer take root, and most animals can't breathe. At Death Zone heights, oxygen levels are less than one-third what they are at sea level. Flying over...
How Can You Breathe On An Airplane?
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