A small piece of dry ice in a balloon or surgical glove is a very good
demonstration to show that you can compress a gas into a very small volume.
It takes a bit of trial and error to get the timing right.
> Sent: Thursday, July 09, 1998 12:25 PM
> To: firstname.lastname@example.org
> Subject: Science Demos for Kids
> I couldn't say "no" when asked to help out with Vacation Bible School at
> a friend's church. I'll be doing "amazing" science demonstrations in the
> opening exercises for 5 evenings. I have some ideas, but does anyone
> have some more good ones. I usually can make almost any "application"
> for any demonstration, so let me hear you favorites.
> You probably should mail me directly, unless you think everyone would
> enjoy it.
> Al McCarrick