Question

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

• A. True
• B. False

Answer 1

The correct option is A True

The main reason for adding helium to the breathing mixture is to reduce the proportions of nitrogen and oxygen below those of air, to allow the gas mixture to be breathed safely on deep dives. A lower proportion of nitrogen is required to reduce nitrogen narcosis and other physiological effects of the gas at depth.