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Heating
Pad Demo
Thank
the teacher for inviting you to school, restate who you are, where
you work, what you do, and the types of people with whom you work.
-
Pick
someone out and ask them to come forward to help you.
-
Take
the portable heat therapy pad out of its box (do not indicate
what it is yet), place it in the student's hands, and ask her
(him) to gently handle the pad and describe how it looks and
feels (squishy, clear, slightly yellow, liquid, cool to the
touch). [You may have to gently prompt
the student to get these answers.]
-
Ask
the student to hold the heating pad up so everyone can see it
and so that the metal disk falls down to a corner of the pad.
Ask your helper to snap the metal disk inside the pad. [Crystallization
is initiat- ed at the disk and spreads throughout the pad in
~30 seconds, accompanied by heat. The pad turns opaque.]
-
Tell
everyone that this is a reusable heating pad for alleviating
aches and pains. It is an example of how technology can be used
to make life better for us. Someone has to be willing to study
math and science in order to invent such things.
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Pass
the heat pad around so everyone can feel the heat.
- Put
the demo away!
Happy
and Unhappy Balls (if time permits)
- Select
another student to come forward.
- Hand
her (him) the two black spheres and ask the student to drop both
onto the table. [As explained in the note
from Arbor Scientific included in your suitcase, the rubber in
one ball is fully vulcanized, retains its shape, and bounces well.
The rubber in the second ball is much more easily deformed and
does not bounce.]
- As
your helper continues to “bounce” the unhappy ball,
ask which kind of rubber would be best suited for the tires of
a racing car or the bottoms of a pair of sneakers. [Ans:
a blend of both, to improve fric- tion or gripping power and to
absorb shocks, but not too “energy absorbing”, because
this is accompanied by high heat from friction and excessive wear.]
The best rubber for a handball is???
- Again,
you might point out that technology and invention are the keys
to improving our lives.
- Put
the demo away!
Copyright
by Stephen D. Jacobs, Rebecca L. Coppens and Christine Andrews-Angelo
December 24, 2001
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This Brochure In PDF Format
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