Vance wrote:

Lower molecular wt of the gas also increases the speed of sound ie the squeaky voice breathing helium.

It's true that lower molecular weight of a gas increases the speed of sound in that medium, but the speed of sound has nothing to do with the "squeaky voice" phenomenon.

Russell Kent

Don't leave us in suspense Russell :-) Why?

Paul Lamar

Russell - You may very well be right in this context - the voice is
generated by the vibration of the vocal cords which would not be changed
only the shaping is done by resonance - we need input from some other
kind of expert on this - Vance

 
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