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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             

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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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For information about the Association of Science-Technology Centers and the Informal Science Education Network please visit www.astc.org.

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