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 Kent wrote:

It's a density effect.  Helium is less dense than air, so the vocal cords vibrate faster.

Russell Kent

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