Masks For High-altitude Climbers
Oxygen masks are used by climbers of high peaks such as Mt. Everest. Because of the severe cold and harsh conditions oxygen masks for use at extreme altitude must be robust and effective. The oxygen storage tanks used with the masks, called oxygen bottles are made of light-weight, high-strength metals and are covered in high-strength fiber such as kevlar. These special oxygen bottles are filled with oxygen at a very high pressure which provides a longer time duration of oxygen for breathing than standard pressure oxygen bottles. These systems are generally only used above 7000 meters.
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