Russell Kent wrote:

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

Cliff Manzke wrote:

Just use 49 times the square root of absolute temperature (in °R) for inlet
air and 48 times the square root of absolute temperature for exhaust gas and
be done with it!  Note that °R = °F + 460.
 

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