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Altitudes above which the pressure of oxygen is insufficient to sustain human life for an extended time span
In mountaineering, the death zone refers to altitudes above a certain point where the pressure of oxygen is insufficient to sustain human life for an extended time span. This point is generally tagged as 8,000 m (26,000 ft), where atmospheric pressure is less than 356 millibars (10.5 inHg; 5.16 psi). The concept was conceived in 1953 by Edouard Wyss-Dunant, a Swiss doctor, who called it the lethal... Wikipedia