Question:
The percentage of helium present in air used by scuba divers is
The percentage of helium present in air used by scuba divers is
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Scuba divers use helium mixtures:
- Reduces nitrogen narcosis
- Helps in deep-sea diving
Updated On: Apr 30, 2026
- $56.2\%$
- $11.7\%$
- $32.1\%$
- $19.7\%$
- $21.5\%$
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The Correct Option is B
Solution and Explanation
Concept:
Air used by scuba divers is a mixture of oxygen and helium called heliox or modified breathing mixture to avoid nitrogen narcosis.
Step 1: Understand composition.
Typical mixture used:
• Oxygen $\approx 21\%$
• Helium $\approx 11.7\%$
• Remaining is mostly nitrogen or adjusted gases
Step 2: Conclusion.
Helium percentage $\approx 11.7\%$
Step 1: Understand composition.
Typical mixture used:
• Oxygen $\approx 21\%$
• Helium $\approx 11.7\%$
• Remaining is mostly nitrogen or adjusted gases
Step 2: Conclusion.
Helium percentage $\approx 11.7\%$
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