The air density at Mount Everest is less than that at the sea level. It is found by mountaineers that for one trip lasting a few hours, the extra oxygen needed by them corresponds to 30,000 cc at sea level (pressure 1 atmosphere, temperature 27 o C ). Everest is – 73 o C and that the oxygen cylinder has capacity of 5.2 litre , the pressure at which O 2 be filled (at site) in cylinder is
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