Bottled oxygen (climbing)

rdf:langString Bottled oxygen (climbing)

rdf:langString Bottled oxygen is oxygen in small, portable, high pressure storage cylinders, as used for high-altitude climbing. Bottled oxygen may also be for a breathing gas, especially for scuba diving or during surgery. (see also diving cylinder and oxygen tank) High-altitude climbing (mountaineering) usually requires the use of portable oxygen apparatus when climbing Mount Everest or the other eight-thousanders, though some mountaineers have ascended Everest without oxygen. The apparatus can be open-circuit (supplementary) or closed-circuit; the 1953 British Mount Everest expedition used both types. The death zone altitude is 26,000 feet (7,900 m) or above.