re: liquid CO2

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From: Eric Muller (emuller@exploratorium.edu)
Date: Fri Jan 21 2000 - 02:59:06 PST 

Message-Id: <l03110700b4ade75611c2@[192.174.3.228]>
Date: Fri, 21 Jan 2000 11:59:06 +0100
From: Eric Muller <emuller@exploratorium.edu>
Subject: re: liquid CO2

A teacher from Japan showed us (at TI) that you could use a clear piece of
tygon tubing. He used very thick gauge tubing. He placed a few small
pieces of dry ice inside the tubing and bent the ends closed with his
hands. After awhile the solid liquefied and the liquid started to boil.
(It's in japanese, but you can check out
http://www.nep.chubu.ac.jp/onsen/meet2/co2.htm)

I put small pieces of dry ice in a clear plastic straw. Then seal and
twist the ends with needle nose pliers. This seems to work well, but the
straw might explode - so use goggles.
(I have this activity in Microsoft Word format, if you want a copy.)

Whatever you use, just be safe. Dry ice liquefies at about 5 atmospheres
of pressure and -60 degrees cenitgrade.

Eric Muller
Staff Teacher
Exploratorium
3601 Lyon St.
San Francisco, CA 94123
415-561-0313
email:emuller@exploratorium.edu

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