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I used to do something similar in various cold shows: invert a CO2 tank and get a kid to hold some heavy black cloth over the nozzle while I cracked it open. Crumbly dry ice would be plainly visible on the cloth and could be put in coloured warm water for all the usual shenanigans.
David Savory
Community Extensions Program Developer and Exhibit Curator
Science World British Columbia
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-----Original Message-----
From: Informal Science Education Network [mailto:[log in to unmask]] On Behalf Of Brian McWilliams
Sent: Friday, September 17, 2010 3:45 PM
To: [log in to unmask]
Subject: Re: dry ice
ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************
We have a tank of compressed liquid CO2, and we dispense it into a small
vessel (~2" x 4" x 8") that is designed for the purpose. The reduction
of pressure causes it to cool and freeze (deposition) into the shape of
the container. The vessel is made of wood with a plastic liner. The
sides of the vessel snap together with a clasp, and separate easily once
the dry ice is formed inside. The top of the vessel has a special
fitting that connects to the CO2 tank. The resulting dry ice is softer
and more workable than that which we get at the grocery store. We use
this for a couple of different programs and the CO2 tank lasts quite a
while.
Brian McWilliams
Public Programs Manager
Sci-Port: Louisiana's Science Center
820 Clyde Fant Parkway
Shreveport, LA 71101
Main Line: (318) 424-8688
Toll free: 1-877-SCIPORT
(1-877-724-7678)
Fax: (318) 222-5592
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-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]] On Behalf Of Jim Taylor
Sent: Friday, September 17, 2010 9:24 AM
To: [log in to unmask]
Subject: dry ice
ISEN-ASTC-L is a service of the Association of Science-Technology
Centers
Incorporated, a worldwide network of science museums and related
institutions.
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*****
Many of us do activities and demos with dry ice. My question is: How
many of you have a dry ice machine on site? If so, where did you get
it? Is it worth it or do you find it easier/cheaper to go to the
grocery store as needed?
Jim Taylor
Vice President of Programs & Exhibits
The Health Adventure
P.O. Box 180
Asheville, NC 28802
828-254-6373 Ext. 313
www.thehealthadventure.org <http://www.thehealthadventure.org/>
"When we lose I can't sleep at night. When we win I can't sleep at
night. But when you win, you wake up feeling better." -- Joe Torre
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