Re: pinhole Heat and Temp. lesson ideas??

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From: Paul Doherty (pauld@exploratorium.edu)
Date: Sun Dec 12 2004 - 12:58:33 PST 

From: "Paul Doherty" <pauld@exploratorium.edu>
Subject: Re: pinhole Heat and Temp. lesson ideas??
Date: Sun, 12 Dec 2004 12:58:33 -0800
Message-ID: <web-7700357@exploratorium.edu>

I use liquid crystal postcards from Edmund's Scientific
which portray different temperatures as different colors
and challenge them to change the color by conduction,
convection, radiation and evaporation.

http://www.exo.net/~pauld/activities/liquidcrystal/liquidcrystal.html

For an advanced experience:

Take two samples of 50 grams of cold water e.g. 10 °C

then boil water containing 50 grams of iron or steel
bolts.

To one of the 50 grams of cold water add 50 grams of steel
at 100°C

To the other add 50 grams of steel.

Feel the temperatures of the resulting mixtures. The water
plus water mixture will be hotter than the water plus seel
mixture by a lot (yu can measure the temperatures for a
high school class)

This might get them thinking that temperature is more
complicated than they thought.

(The specific heat of steel is much less than the specific
heat of water, about a third if I recall rightly.)

Paul D

On Sun, 12 Dec 2004 12:03:27 -0500 (EST)
  Hugh <hugh@apocalypse.org> wrote:
>I have to teach a single (just one day) 6th grade class.
>The topic is an
>introduction to heat and temperature. Anyone have any
>good ideas for
>activities? I'm going to have them dip thier hands in
>cool and hot water,
>then both in room temp. water, so they can feel the
>difference...
>I'm unable to think of anything else to do to engage
>them. Please send me
>any ideas you might have.
>
>Thank you!
>Hugh Lovette
>510-549-1395
>
>
>
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