Date: Fri, 02 Dec 2011 16:34:51

Author: --- chuck britton

Subject: Re: Sulfur Hexafluoride: who's using?


And PLEASE don't say that these pitch changes arise from the
different speed of sound IN THE GAS!
Any change must be explained from a change in the resonant frequency
of the bell (or your chest cavity for those demos).

Transmission of sound through the gas preserves frequency. Wavelength
is what changes with speed.

(Unless I'm wrong, of course ;-) )
At 4:21 PM -0500 12/2/11, Borislaw Bilash II wrote:
>Fill a jar with SF6 and then slowly immerse a ringing bell into the jar and
>listen to the pitch change. Although I haven't tried -- I imagine that you
>can seal the jar and keep the gas for another day. Just don't spill the
>The same thing can be done with an inverted jar filled with helium.