Liquid nitrogen will never get boring.

Throwing a little on a tile floor is an instant sweep. Shattering superballs
etc.

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of michael brown
Sent: Tuesday, May 21, 2002 4:34 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [OT]: Demos for Kids (Was NCSU Physics demo room)


> Tomorrow I have to put on a show for some first grade 7 year olds in my
lab.
> In the past, I trotted out this old vacuum chamber that we never use for
> anything else.  I usually boil some room temperature water in it, then
take
> it out and drink it down, put a small ballooon in it and watch it get big
> under vaccuum, and the like.  This time I'm thinking about putting a
candle
> flame inside and watching it go out.
>
> I'm trying to think of some other cool things one can do in a modestly
> equipped lab that impress first graders.  Without maiming any of the
little
> rugbiters.

Marshmallows are kinda fun with a vacuum chamber.  They get pretty large,
till you let the air back in, then they're pretty small.  ;-)  Most kids
like explosions, so perhaps some HCl and Zinc in a test-tube to create tiny
hydrogen booms (this is safe unless you trap the gas under pressure, in
which case you could blow the bottom out of a test-tube).  Sodium is always
fun.  ;-)  You could also "float" a needle on water.

michael brown

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