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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 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]
English: Based on User:Geek.not.nerd's "Atmospheric Pressure vs. Altitude.png" graph. Only change is the indication of the air pressure (and altitude) of Mount Everest Only change is the indication of the air pressure (and altitude) of Mount Everest
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. [274]
Typical ambient pressure in standard atmospheres; Hard vacuum of outer space: 0 atm Surface of Mars, average 0.006 atm [2] Top of Mount Everest – 8,849 m (29,032 ft) 0.333 atm [3] Pressurized passenger aircraft cabin altitude 8,000 ft (2,400 m) 0.76 atm [4] Sea level atmospheric pressure: 1 atm Surface of Titan: 1.45 atm 10 m depth in ...
Lung air pressure difference moving the normal breaths of a person (only 0.3% of standard atmospheric pressure) [35] [36] 400–900 Pa 0.06–0.13 psi Atmospheric pressure on Mars, < 1% of atmospheric sea-level pressure on Earth [37] 610 Pa 0.089 psi Partial vapor pressure at the triple point of water (611.657 Pa) [38] [39] 10 3 Pa
On 8 May 1978, Reinhold Messner and Peter Habeler made the first ascent of Mount Everest without supplemental oxygen. [40] Messner had ascended all 14 "eight-thousanders" without supplemental oxygen by 1986. Running out of bottled oxygen was noted as a factor in the 1979 deaths of Ray Genet and Hannelore Schmatz on Mount Everest. [41]
Using the values T=273 K and M=29 g/mol as characteristic of the Earth's atmosphere, H = RT/Mg = (8.315*273)/(29*9.8) = 7.99, or about 8 km, which coincidentally is approximate height of Mt. Everest. For an isothermal atmosphere, or about 63% of the total mass of the atmosphere exists between the planet's surface and one scale height. (The ...