![]() US spacesuits have been pressurized at 0.30 bar (30% earth sea level pressure), but because the gas in the suit is 100 percent oxygen instead of 20 percent, the person in a spacesuit actually has more oxygen to breathe than is available at an altitude of 3,000 m without the spacesuit. At this altitude the total air pressure is no longer sufficient to keep body fluids from boiling. Above the 19,000 m threshold, humans must wear spacesuits that supply oxygen for breathing and that maintain a pressure around the body to keep body fluids in the liquid state. ![]() At 5,500 m, the atmosphere is half as dense as it is on the ground, and at altitudes above 12.000 m, air is so thin and the amount of oxygen so small that pressure oxygen masks no longer do the job. But in order to work outside the spacecraft, humans need the protection of a spacesuit.Įarth's atmosphere is 20 percent oxygen and 80 percent nitrogen from sea level to about 120 km. ![]() ![]() Inside the spacecraft, the atmosphere can be controlled so that special clothing is not needed. To explore and work in space, human beings must take their environment with them because there is no atmospheric pressure and no oxygen to sustain life. ![]()
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