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Incorporated, a worldwide network of science museums and related institutions.
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We have done this demo for large groups many times but never in doors.  We also keep visitors at least 50 feet or more away (depending on the size of the bottle we use and how much liquid nitrogen.  As long as people are far enough away from the bucket there should little chance of anything going wrong.  Our motto is always "Safety First!"

Max Scharfenberger
VP Programs
Odyssium
11211 142 Street
Edmonton, AB  T5M 4A1
phone: 780-452-9100
fax: 780-455-5882
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-----Original Message-----
From: Informal Science Education Network
[mailto:[log in to unmask]]On Behalf Of Jonah Cohen
Sent: Wednesday, January 26, 2005 1:12 PM
To: [log in to unmask]
Subject: Re: Large Assembly Programs


ISEN-ASTC-L is a service of the Association of Science-Technology Centers
Incorporated, a worldwide network of science museums and related institutions.
*****************************************************************************

I love a good kaboom as much as the next guy (ok, more than the next guy),
but I must ask: isn't the demo below pushing the envelope of safety?

Jonah Cohen
Outreach & Public Programs Manager
Science Center of Connecticut

"The difference between genius and stupidity is that genius has limits."
         -Albert Einstein

-----Original Message-----
From: Fisher, Martin [mailto:[log in to unmask]] 
Sent: Monday, January 24, 2005 10:13 AM
To: [log in to unmask]
Subject: Re: Large Assembly Programs

3) A little liquid N2 poured into a small plastic container, screw-on the
cap, toss it into a strong metal bin filled w/ water. The nitrogen changes
into a gas, pressure increases and the bottle will explode. Move way and
make sure that you're not near the audience. Small bottles (shampoo bottles
from hotels) work well. The bigger the bottle (soda bottles), the bigger the
explosion and the danger. Wear gloves, goggles and ear muffs.

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