Planes have lower oxygen levelsIf this didn't happen, everyone inside the plane would die, as the low air pressure at the elevations planes fly (typically 35,000 feet or so) means there isn't enough oxygen present for your body to function.
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Importance to MembersAnd that at cabin altitudes above 14,000 feet pilots must use oxygen at all times. And that above 15,000 feet each occupant of the aircraft must be provided supplemental oxygen. All of this is spelled out in Federal Aviation Regulations Part 91.211.
Acute altitude sickness arises after at least four hours spent at an altitude above 2,000 m. Ascending to heights greater than 2,500 m can trigger a range of symptoms including headache and vomiting. Men are at greater risk of altitude sickness than women, for reasons unknown.
The mountain most widely claimed to be the highest unclimbed mountain in the world in terms of elevation is Gangkhar Puensum (7,570 m, 24,840 ft). It is in Bhutan, on or near the border with China. In Bhutan, the climbing of mountains higher than 6,000 m (20,000 ft) has been prohibited since 1994.
Temperature of Mount EverestThe temperature at the Mt.Everest summit in January is average -33° F (-36° C) and it can drop to -76° F (-60° C) even. The average summit temperature in July is -2° F (-19° C). Generally speaking, its cooler at night and a tiny bit warmer in the day.
Sometime between 1 and 2 in the afternoon on May 8, 1978, Messner and Habeler achieved what was believed to be impossible—the first ascent of Mt. Everest without oxygen.