0 Helium

Helium :

Colorless , odorless.

Mixture - 79% Helium + 21% O2 =  "Heliox"

  • Lower density than air
  • Used for upper airway obstruction.
  • Not useful in lower airway.

Also used to 
  • study lung volume by gas dilution technique.
  • prevent Nitrogen Narcosis.

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