2006-08-16 23:47:07 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Engineering
There are some tribes in the Andes who regularly work at altitudes of 12,000 feet.
The FAA requires pilots and critical crew members be on oxygen at altitudes above 12,500 feet if they will be at those altitudes for more than 30 minutes, and on oxygen for all altitudes above 14,000 feet. Oxygen has to be supplied to all persons on the A/C at altitudes above 15,000 feet.
Doug
2006-08-17 00:07:44 · answer #1 · answered by doug_donaghue 7 · 1⤊ 0⤋
Many mountaineers have now climbed Everest (8846m or 29,022ft) without oxygen, where the air ressure is just 30% of that at sea level. However, they are climbing, so the oxygen demand is high. Just sitting still, for example in an un-pressurised balloon cabin, would allow ascent to greater height. A trained person might tolerate as little as 20% sea level oxygen for at least short time; this would equate to around 12,000m or nearly 40,000ft. However, intense cold is likely to be more of a barrier to going so high.
2006-08-17 07:37:37 · answer #2 · answered by Paul FB 3 · 0⤊ 0⤋
Man cannot survive at any altitude without oxygen.
2006-08-17 07:54:07 · answer #3 · answered by greebo 3 · 4⤊ 1⤋