Gas that makes your voice sound higher (6)

I believe the answer is:

helium

(Other definitions for helium that I've seen before include "Light colourless gas used in airships" , "Light colourless gas, sometimes in balloons" , "Light colourless gas used in balloons" , "Floating balloon gas" , "Second lightest element" .)

I've seen this clue in the USA Today.

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