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| | Space Suits |
 | | 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. |
 | | 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. |
 | | The AX-3 was an 0.5 bar suit, 23 kg, 0.5 to 0.7 bar operational pressure, with improved mobility and was completed in 1977. |
| www.astronautix.com /craftfam/spasuits.htm (5949 words) |
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