Re: Pumpkin with a cold

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From: Eric Muller (emuller@isaac.exploratorium.edu)
Date: Mon Nov 08 1999 - 23:43:05 PST 

Message-Id: <l03110705b44d7d5a88d2@[206.173.231.157]>
Date: Mon, 8 Nov 1999 23:43:05 -0800
From: Eric Muller <emuller@isaac.exploratorium.edu>
Subject: Re: Pumpkin with a cold

Sue,

You asked for my recipe for "Pumpkin with a Head-Cold."

Materials:
A large pumpkin
Dry Ice
Soapy water
Marker pen
Knife

Draw a picture of a face on the front of the pumpkin with a marker pen.
Cut off the top of the pumpkin and only cut-out the pumpkin's nose.
Take the top off the pumpkin and pour soapy water into the pumpkin.
Then dump dry ice into the pumpkin
Replace the pumpkin's top.

What happens next?
The dry ice and soapy water interact at the bottom of the pumpkin. The dry
ice sublimates (goes directly from solid phase to gas phase) in the soapy
water and causes tons of bubbles to form. The bubbles rise up inside the
"pumpkin head" and only have one place to exitŠ through the nose. You get
a great bubbly running nose!

This demo can also be seen on TI's Iron Science Teacher webcast site. This
show was seen on Oct. 30th and is archived along with several other Iron
Science Teacher episodes

Iron Science Teacher Web site:
http://www.exploratorium.edu/iron_science/

Eric Muller
Exploratorium Teacher Institute
Science Teacher on Staff
3601 Lyon St.
San Francisco, CA 94123

415-387-7930
emuller@exploratorium.edu

www.doscience.com

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