Question

Instead of nitrogen helium is added to oxyfen oxygen usex by deep sea divers because

Answer 1

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The main reason for adding helium to the breathing mix is to reduce the proportions of nitrogen and oxygen below those of air, to allow the gas mix to be breathed safely on deep dives. ... Helium has very little narcotic effect. A lower proportion of oxygen reduces the risk of oxygen toxicity on deep dives.

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