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Why not just do it with sugar (which becomes glassy!)
I will look for some of the recipes...
costs a lot less too.
tracy nolan
Saint Louis

On Thu, Jul 22, 2010 at 10:07 AM, Mike Levad <[log in to unmask]>wrote:

> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related
> institutions.
>
> *****************************************************************************
>
> Hi Everybody,
>
> I am hoping some of you might be able to help me out here.  We are working
> on an exhibit about the glass industry and we have two phenomena that may
> be
> quite difficult to demonstrate.
>
>
> #1. Coefficent of Expansion.   If the exterior of a piece of glass cools
> faster than the interior it can produce compressive forces strong enough to
> shatter the material. I did a great experiment with this in my buddy's
> kitchen when were in Jr. High.  We nuked some marbles in his mom's 1970's
> vintage super powerful microwave and then we would drop them in ice-water
> causing them to shatter.   This would not be terribly suitable for a museum
> exhibit for lots of reasons, consumables, small parts, unsafe temperatures,
> broken glass etc.
>
> #2 Viscosity. The viscosity of glass changes about 20 orders of magnitude
> from its water like state when it is poured to its solid state at room
> temp.
> Once again we are dealing with super high temps etc.
>
> Any ideas you might have would be much appreciated.
>
> Thanks,
>
> Mike
>
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