Multiple choice

Scuba divers use __________ in their gas cylinders.

  1. helium and oxygen

  2. oxygen and halogen

  3. helium and hydrogen

  4. oxygen and methane

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

Scuba divers use a mixture of helium and oxygen, known as heliox, to prevent nitrogen narcosis and oxygen toxicity at greater depths.