On 19 veebr, 16:00, CharlesRCap...@[EMAIL PROTECTED]
wrote:
> On Feb 17, 9:13 pm, jmcphee...@[EMAIL PROTECTED]
wrote:
>
> > Is this really a real effect or is it a special effect of some
kind?http://youtube.com/watch?v=XjCmwuGKR6g
> > I don't believe the voices!
>
> The scientific explanation:
>
> In air (a mixture of oxygen, nitrogen, and carbon dioxide, as well as
> other trace elements) sound has a medium rate of travel. (i.e. The
> sound waves travel at about 340 m/s at sea level.) Because of this
> medium rate of travel voices (which are created by vibrating your
> vocal cords in your throat) sound normal. The vibrations travel
> through the air at their normal speed. when you inhale helium and then
> speak the sound of your voice gets higher because the sound of your
> vibrating vocal cords travels faster in helium than in air. With
> sulfur hexafluoride it's the opposite, the sound of your vibrating
> vocal cords travels slower making the sound deeper. As has been
> mentioned elsewhere, there is nothing special about sulfur
> hexafluoride that other heavy gasses can't do, except that it won't
> kill you if you inhale it. (As long as you make sure you get some
> oxygen into your system often enough that you don't pass out.)
Or continuously. Just mix the sulphur hexafluoride with adequate
amount of of oxygen beforehand.
But sulphur hexafluoride is narcotic. More so than argon and even
krypton.
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