inert gas

noun

, Chemistry.

inert gas

Also callednoble gasrare gasargonon any of the unreactive gaseous elements helium, neon, argon, krypton, xenon, and radon
(loosely) any gas, such as carbon dioxide, that is nonoxidizing

inert gas

First recorded in 1900–05

The volume of flame, however, is increased by inert gas, and there is a proportionate diminution of the heating effect.

Briefly Arcot and Wade discussed the unusual atmosphere, finally deciding that the inert gas was argon.

The inert gas, nitrogen, had been discovered a year or two before.

Nitrogen by itself is an inert gas, colorless and uninflammable.

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