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http://www.youtube.com/watch?v=6V2eCFsDkK0
This is a very cool demo! I've experienced it first-hand and this video captures it.
C
On Jul 22, 2010, at 8:11 AM, Mary Catherine Campbell wrote:
> ISEN-ASTC-L is a service of the Association of Science-Technology Centers
> Incorporated, a worldwide network of science museums and related institutions.
> *****************************************************************************
>
> Many years ago, we would obtain green glass insulators from poles along
> the highways. (I don't know how we got them.)
> We would put them into the oven for quite a while and then remove them
> and drop them in cold water and get the shattering.
> I created a beautiful paper weight or such.
>
> mc
>
>
> Mary Catherine Campbell
> Sr. Educational Services Coordinator
>
> Arizona Science Center
> PHONE: 602-253-4219 ext 234 | FAX: 602-253-4166
>
> [log in to unmask]
>
> P Before printing this e-mail think if it is necessary. Think Green!
>
>
> -----Original Message-----
> From: Informal Science Education Network
> [mailto:[log in to unmask]] On Behalf Of Mike Levad
> Sent: Thursday, July 22, 2010 8:07 AM
> To: [log in to unmask]
> Subject: Properties of Glass
>
> 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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Charles Carlson
Senior Scientist
exploratorium
3601 Lyon St.
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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.
Check out the latest case studies and reviews on ExhibitFiles at www.exhibitfiles.org.
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