Multiple choice general knowledge science & technology

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is

  1. Argon

  2. Xenon

  3. Helium

  4. Krypton

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Helium is used in diving gas mixtures (like Heliox) because it's inert and reduces nitrogen narcosis risk at depth. Unlike nitrogen, helium doesn't dissolve into tissues as readily, decreasing decompression sickness risk.