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Humans are generally adapted to lowland environments where oxygen is abundant. [12] At altitudes above 2,500 meters (8,200 ft), such humans experience altitude sickness, which is a type of hypoxia, a clinical syndrome of severe lack of oxygen. Some humans develop the illness beginning at above 1,500 meters (5,000 ft). [13]
People who are predisposed to develop high-altitude pulmonary edema may present a reduction in urine production before respiratory symptoms become apparent. [ 15 ] Humans have survived for two years at 5,950 m (19,520 ft, 475 millibars of atmospheric pressure), which is the highest recorded permanently tolerable altitude; the highest permanent ...
A fluid dynamics lab experiment illustrates flow past a mountain-shaped obstacle. Downstream wave crests radiate upwards with their group velocity pointing about 45° from horizontal. A downslope jet can be seen in the lee of the mountain, an area of lower pressure, enhanced turbulence, and periodic vertical displacement of fluid parcels.
Experts have described turbulence as ‘common’ and asserted that it ‘rarely’ leads to fatalities.
Over 81 million people live permanently at high altitudes (>2,500 m or 8,200 ft) [52] in North, Central and South America, East Africa, and Asia, and have flourished for millennia in the exceptionally high mountains, without any apparent complications. [53] For average human populations, a brief stay at these places can risk mountain sickness. [54]
Air travel and turbulence have always gone hand in hand with many flights, especially long haul, experiencing spells of bumpiness. The severe episode on board a Singapore Airlines plane in which ...
One person is dead, and 30 are injured after a Singapore Airlines flight hit severe turbulence. "We can confirm that there are injuries and one fatality on board the Boeing 777-300ER," said SIA ...
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 ]