Below are possible answers for the crossword clue Inert gas.
a colorless and odorless inert gas; one of the six inert gases; comprises approximately 1% of the earth's atmosphere
a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas)
a colorless odorless gaseous element that give a red glow in a vacuum tube; one of the six inert gasses; occurs in the air in small amounts
a colorless odorless inert gaseous element occurring in the earth's atmosphere in trace amounts
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