From:	Logan Graves <logan1@*****.INTERCOM.NET>
Subject:	Re: thermographic vision-question
Date:	Tue, 2 Feb 1999 22:20:00 -0500

In our last episode, Marc Renouf wrote:
>
> > As for Sonar, I can't imagine solid objects being transparent to sound
> > waves. Although, admittedly it's not my field.
>
> Your gut instinct is right. Glass is opaque to ultrasound.

Of course it is.

Sound travels better through liquids, than it does through gases.
AND it travels *even* better through solids!
Otherwise, it'd be pretty pointless to get an ultrasound.

Of the three, air (a gas) is the poorest medium for propagating sound
waves (discounting vacuums, that is).

-Fenris

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