1) Breathing gas
Found on
https://www.crosswordclues.com/clue/breathing-gas
A breathing gas is a mixture of gaseous chemical elements and compounds used for respiration. The essential component for any breathing gas is a partial pressure of oxygen of between roughly 0.16 and 1.60 bar at the ambient pressure. The oxygen is usually the only metabolically active component unless the gas is an anaesthetic mixture. Some of the...
Found on
http://en.wikipedia.org/wiki/Breathing_gas
No exact match found.
