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Informal Science Education Network <[log in to unmask]>
Date:
Mon, 2 Apr 2007 12:59:11 -0500
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Informal Science Education Network <[log in to unmask]>
Subject:
Re: Buoyancy
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From:
Phillip Keck <[log in to unmask]>
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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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If it needs to be exactly 6x6x3 and needs to be wood, you could make a box out of plywood.  Fill it with sand or something to get it to sink as far as you need it to.  

If it doesn't need to be wood, you can use ultra-high molecular weight polyethylene, which is slightly less dense than water (it's specific gravity is like 0.9 or so, so it might sink a little more than you're looking for), and is very stable.  McMaster has a 6x6x3 piece for $26.

Phil
Museum of Science and Industry, Chicago 

-----Original Message-----
From: Informal Science Education Network [mailto:[log in to unmask]] On Behalf Of Wayne Watson
Sent: Monday, April 02, 2007 12:30 PM
To: [log in to unmask]
Subject: Buoyancy

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

I'm thinking of a simple buoyancy demo that could usefully employ a 
6x6x3" of wood. Pieces that size are typically 5.5x5.5xX*. Also they 
tend to split if left to dry. Any ideas on a substitute? I want 
something that sinks reasonably into the water, maybe 1/2 the depth. I'm 
also looking for a 40-50 quart plastic container that is fairly 
transparent. I've seen a few in a local h/w store, but they might have a 
transparency of 50%.

* I want to keep the dimesnions some reasonable fraction of a cubic foot.
-- 

           Wayne Watson (Watson Adventures, Prop., Nevada City, CA)

             (121.015 Deg. W, 39.262 Deg. N) GMT-8 hr std. time)
              Obz Site:  39° 15' 7" N, 121° 2' 32" W, 2700 feet

              Frank and Ernest cartoon: Frank says, "Ther're two 
              American holidays honoring the military, one in May, 
              and one in November." Ernest,"You'd think at least 
              there would be one in March?"

                  Web Page: <www.speckledwithstars.net/>

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More information about the Informal Science Education Network and the
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