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The summit of Mount Everest lies in the death zone. In mountaineering, the death zone refers to altitudes above which the pressure of oxygen is insufficient to sustain human life for an extended time span. This point is generally agreed as 8,000 m (26,000 ft), where atmospheric pressure is less than 356 millibars (10.5 inHg; 5.16 psi). [1]
The atmospheric pressure at the top of Everest is about a third of sea level pressure or 0.333 standard atmospheres (337 mbar), resulting in the availability of only about a third as much oxygen to breathe.
The temperature of the atmosphere decreases by a lapse rate, mostly caused by convection and the adiabatic expansion of air with decreasing pressure. [44] At the peak of Mount Everest, the average summer temperature is −19 °C (−2 °F) and the average winter temperature is −36 °C (−33 °F). [45]
High altitude breathing apparatus is a breathing apparatus which allows a person to breathe more effectively at an altitude where the partial pressure of oxygen in the ambient atmospheric air is insufficient for the task or to sustain consciousness or human life over the long or short term. High altitude breathing sets may be classified by type ...
40% at 3,000 metres (10,000 ft) [1][2] Altitude sickness, the mildest form being acute mountain sickness (AMS), is a harmful effect of high altitude, caused by rapid exposure to low amounts of oxygen at high elevation. [1][2][3] People's bodies can respond to high altitude in different ways. Symptoms of altitude sickness may include headaches ...
The Armstrong limit or Armstrong's line is a measure of altitude above which atmospheric pressure is sufficiently low that water boils at the normal temperature of the human body. Exposure to pressure below this limit results in a rapid loss of consciousness, followed by a series of changes to cardiovascular and neurological functions, and ...
On April 18, 2014, 16 Sherpas were killed in an avalanche in the Khumbu Icefall. [11][12][13] On April 25, 2015, 19 people—the most ever in a single day on Everest—were killed in an avalanche at base camp after a 7.8 earthquake, which killed more than 9,000 people and injured more than 23,000 in Nepal. [14][15][16] During the 2023 season, a ...
The typical atmospheric pressure at the top of Olympus Mons is 72 pascals, about 12% of the average Martian surface pressure of 600 pascals. [22] [23] Both are exceedingly low by terrestrial standards; by comparison, the atmospheric pressure at the summit of Mount Everest is 32,000 pascals, or about 32% of Earth's sea level pressure. [24]