High Quality Content by WIKIPEDIA articles! Heliox is a breathing gas composed of a mixture of helium and oxygen. Heliox has been used medically since the 1930s, and although the medical community adopted it initially to alleviate symptoms of upper airway obstruction, its range of medical uses has since expanded greatly, mostly because of the low density of the gas. Heliox is also used in saturation diving and sometimes during the deep phase of technical dives.

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