Armstrong Limit Boils Lung Fluids

Above 19,200 meters, or 63,100 feet, above sea level on earth, the human body reaches the Armstrong limit, where survival without protection becomes impossible. At this altitude, the air pressure is so low that the fluids in your lungs begin to boil at body temperature, preventing oxygen from properly entering the bloodstream no matter how much you try to breathe. This is why pilots and astronauts require pressurized suits to survive at these extreme altitudes.

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