Question

9. Deep sea divers carry oxygen diluted by helium in
cylinders instead of air. Give reasons.
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Answer 1

Answer:

Explanation:

This happens at around 1.6bar, or 67 meters deep if you're breathing air. So, to dive deeper than 67 meters safely, deep-sea divers need to reduce the partial pressure of oxygen, by diluting it with something inert. We can't add more Nitrogen, as that causes decompression sickness, so we use Helium because it's inert.