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Heliox (helium/oxygen mixtures) is a breathing gas composed of a mixture of helium (He) and oxygen (O2). Heliox is a medical treatment for patients with difficulty breathing. The mixture generates less resistance than atmospheric air when passing through the airways of the lungs, and thus requires less effort by a patient to breathe in and out of the lungs. Heliox is also used in saturation diving and sometimes during the deep phase of technical dives.
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