Q8 of 25 Page 154

The mixture of gases used by deep-sea divers is _______(helium-oxygen, oxygen-nitrogen)

The mixture of gases used by deep-sea divers is helium-oxygen.

In deep-sea, the pressure is very high which affect the solubility of oxygen in our blood. Under high pressure, the solubility of oxygen can increase to a threatening level in our blood (because of the solubility of gases in liquid increases with the increase in pressure). To prevent such a condition, we need to dilute oxygen with some other inert (non-reactive) gas. So, we use helium which is a non-reactive gas as compared to nitrogen.


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