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Originally Posted by MexSiR
Yeah its the preassure. The lower you are it means more air is on top of your head, pushing on you harder. This is why you can breathe easily when your at the sea, but when your on very high places its harder to breathe. If a car has more air pushing down on the engine, it is easier for the cars engine to "breathe" just like a human being.
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lol. its ok man. Its only hard to breathe at high altitudes cause of the lack of oxygen, which is why they take those oxygen tanks with them when they go really high. Air pressure pushes on us in every possible direction, unlike gravity. There's typically a higher concentraion of O2 in denser air, which is why you might run rich in higher altitude places.