Date: Wed, 24 Sep 2003 17:18:29 -0400

Author: Gerald Zani

Subject: Unmixing

Post:

Tappers,

When I do the Unmixing demo (see link below to Dick's description) with
Glycerin and dye I have trouble with heavy smearing when I unmix.

http://www.physics.umd.edu/lecdem/services/demos/demosf4/f4-12.htm

Any tips would be appreciated. Jerry
Gerald Zani e-mail: Gerald_Zani@brown.edu
Manager of Demonstrations phone: (401) 863-3964
Department of Physics FAX: (401) 863-2024
Brown University Providence, RI 02912-1843 USA

URL http://www.physics.brown.edu/users/staff/zani/index.html
URL http://www.physics.brown.edu/Studies/Demo/

Do a little more of that work which you have confessed to be good,
Which you feel that society and your most Just Judge rightly demand of you.
Cultivate the tree which you have found to bear fruit in your soil.
If you have any experiments you would like to try, try them.
Now's your chance.
Henry David Thoreau, Journal entry, 1850.
From gnper090@wviz.org Wed Sep 24 15:13:59 2003
From: "Dick Heckathorn"
To:
Subject: RE: Advice, please
Date: Wed, 24 Sep 2003 17:58:08 -0400
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Greetings,

I have both the analog (15 or so years)and digital (4 years) meters from
Radio Shack. Of the two, I like the digital best yet both are great.
Much less expensive than science suppliers.

Dick

"Science is nothing more than learning how to communicate with nature in
such a manner that it will talk back."

Helping teachers who facilitate, motivating students who learn.
Dick Heckathorn 14665 Pawnee Trail Middleburg Hts, OH 44130
440-826-0834
Physics Teacher CVCA 4687 Wyoga Rd Cuyahoga Falls, OH 44224
330-929-0575 VM 120

-----Original Message-----
From: owner-tap-l@listproc.appstate.edu
[mailto:owner-tap-l@listproc.appstate.edu] On Behalf Of J. Terrence
Klopcic
Sent: Wednesday, September 24, 2003 9:16 AM
To: tap-l@listproc.appstate.edu
Subject: Advice, please

Colleagues,

We are in the market for a "speed gun" and a sound volume (decibel)
meter. Any recommended models and sources?

Thanks in advance.

Terry

------=_NextPart_000_001D_01C382C5.8AA8EAC0
Content-Type: text/html;
charset="us-ascii"
Content-Transfer-Encoding: quoted-printable


xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns=3D"http://www.w3.org/TR/REC-html40">


charset=3Dus-ascii">











style=3D'tab-interval:.5in'>



style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>Greetings,
<=
/p>

style=3D'font-size:
10.0pt;font-family:Arial;color:blue'> 



style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>I have both the analog (15 or so =
years class=3DGramE>)and
digital (4 years) meters from Radio Shack. Of =
the two,
I like the digital best yet both are great. style=3D'mso-spacerun:yes'> Much less =
expensive than
science suppliers.



style=3D'font-size:
10.0pt;font-family:Arial;color:blue'> 



style=3D'font-size:
10.0pt;font-family:Arial;color:blue'>Dick



style=3D'font-size:
10.0pt;font-family:Arial;color:blue'> 





style=3D'mso-bidi-font-weight:
normal'> style=3D'font-size:
10.0pt;color:blue;font-weight:bold;mso-bidi-font-weight:normal;mso-no-pro=
of:
yes'>"Science is nothing more than learning how to communicate with =
nature
in such a manner that it will talk =
back."



size=3D2
color=3Dblue face=3D"Times New Roman"> style=3D'font-size:11.0pt;color:blue;
font-weight:bold;mso-bidi-font-weight:normal;mso-no-proof:yes'> =
;



style=3D'mso-bidi-font-weight:
normal'> style=3D'font-size:
10.0pt;color:blue;font-weight:bold;mso-bidi-font-weight:normal;mso-no-pro=
of:
yes'>Helping teachers who facilitate, motivating students who =
learn.



size=3D1
color=3Dblue face=3D"Times New Roman"> style=3D'font-size:8.0pt;color:blue;
mso-no-proof:yes'>Dick Heckathorn  =
14665
Pawnee Trail  Middleburg =
Hts, OH style=3D'mso-spacerun:yes'> 
44130 style=3D'mso-spacerun:yes'> 
440-826-0834



size=3D1
color=3Dblue face=3D"Times New Roman"> style=3D'font-size:8.0pt;color:blue;
mso-no-proof:yes'>Physics Teacher CVCA style=3D'mso-spacerun:yes'> 
4687 Wyoga Rd  =
Cuyahoga Falls, OH
44224  330-929-0575 style=3D'mso-spacerun:yes'> 
VM =
120





style=3D'font-size:
10.0pt;font-family:Arial;color:blue'> 



face=3DTahoma> style=3D'font-size:10.0pt;font-family:Tahoma'>-----Original =
Message-----

From:
owner-tap-l@listproc.appstate.edu =
[mailto:owner-tap-l@listproc.appstate.edu] style=3D'font-weight:bold'>On Behalf Of J. Terrence =
Klopcic

Sent: Wednesday, =
September 24,
2003 9:16 AM

To: =
tap-l@listproc.appstate.edu

Subject: Advice, =
please



face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 





face=3DArial> style=3D'font-size:10.0pt;font-family:Arial'>Colleagues, p>







face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 







face=3DArial> style=3D'font-size:10.0pt;font-family:Arial'>We are in the market for a
"speed gun" and a sound volume (decibel) meter.  Any =
recommended
models and sources?







face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 







face=3DArial> style=3D'font-size:10.0pt;font-family:Arial'>Thanks in =
advance.







face=3D"Times New Roman"> style=3D'font-size:12.0pt'> 







face=3DArial> style=3D'font-size:10.0pt;font-family:Arial'>   
            =
   
    Terry











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From dstille@newton.physics.uiowa.edu Wed Sep 24 15:20:08 2003
Date: Wed, 24 Sep 2003 17:03:30 -0500 (CDT)
From: Dale Stille
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To: tap-l@listproc.appstate.edu
Subject: Re: Unmixing
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JZ,

Sounds like you are getting some turbulance produced from the wall of your
apparatus. Either they could be too close together, or one of the walls
may be too rough and carrying a larger than anticipated thickness of
glycerin around with it. My normal separation
is 1 1/4 inches between the nonrotating and rotating cylinder walls.
Couple of other things I found that help optimize this is to chill the
glycerin, and use either pure food coloring or better yet ink that does
not have water in its make-up. Water will easily dissolve into
the glycerin so anything to minimize that process will cut down on the
smearing.
Opps, another thing is to only wait 10 to 15 seconds between the mixing
and unmixing steps.

Dale


On Wed, 24 Sep 2003, Gerald Zani wrote:

> Tappers,
>
> When I do the Unmixing demo (see link below to Dick's description) with
> Glycerin and dye I have trouble with heavy smearing when I unmix.
>
> http://www.physics.umd.edu/lecdem/services/demos/demosf4/f4-12.htm
>
> Any tips would be appreciated. Jerry
> Gerald Zani e-mail: Gerald_Zani@brown.edu
> Manager of Demonstrations phone: (401) 863-3964
> Department of Physics FAX: (401) 863-2024
> Brown University Providence, RI 02912-1843 USA
>
> URL http://www.physics.brown.edu/users/staff/zani/index.html
> URL http://www.physics.brown.edu/Studies/Demo/
>
> Do a little more of that work which you have confessed to be good,
> Which you feel that society and your most Just Judge rightly demand of you.
> Cultivate the tree which you have found to bear fruit in your soil.
> If you have any experiments you would like to try, try them.
> Now's your chance.
> Henry David Thoreau, Journal entry, 1850.
>
>
From reberg@physics.umd.edu Wed Sep 24 18:31:08 2003
X-Authentication-Warning: student1.physics.umd.edu: reberg owned process doing -bs
Date: Wed, 24 Sep 2003 21:14:31 -0400 (EDT)
From: Richard Berg
To: tap-l@listproc.appstate.edu
Subject: Re: Unmixing
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Jerry,

I presume that your device has worked properly on a regular basis in the
past. Therefore, I would suggest changing the glycerine to make sure that
it is pure. Make up a new shot of dye mix that is pretty thick so it will
not tend to flow on its own.

If the design of your unmixer is according to the original Merzbacker
plans it should work fine.

Dick Berg

***********************************************************************
Dr. Richard E. Berg, Professor of the Practice
Director, Physics Lecture-Demonstration Facility
U.S. mail address:
Department of Physics
University of Maryland
College Park, MD 20742-4111
Phone: (301) 405-5994
FAX: (301) 314-9525
e-mail reberg@physics.umd.edu
www.physics.umd.edu/lecdem
***********************************************************************
From gnunes@mailaps.org Wed Sep 24 20:52:28 2003
Message-ID: <3F726297.8267DC1@mailaps.org>
Date: Wed, 24 Sep 2003 23:35:51 -0400
From: gnunes
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Subject: Re: Unmixing
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Gerald Zani wrote:
>
> When I do the Unmixing demo (see link below to Dick's description) with
> Glycerin and dye I have trouble with heavy smearing when I unmix.

I've done it with karo syrup and it works extremely well. We used a
long glass rod to poke the colored stripes in so they were nice and
straight. Use 3 different colors (food coloring) separated by 1.5 to 2
inches. When the separate stripes all come back at once it is quite
dramatic.

Since you raise the topic, what are the group's thoughts on what this
actually teaches?

I use it to back up the idea of reversible state changes in
thermodynamics. I make a small change (twist of the cylinder) and then
bring it back. Then I make larger and larger excursions up to maybe 1/2
a rotation, bringing it back every time. Then I ask the class how far
they think I can go and bring it back. The usual vote is 5, so I do it
10, which brings on the oohs and ahhs. The key is to do it slowly, both
because it works better, and because reversible state changes are
supposed to be small _and_ slow.

-Geoff
From Jim_Kernohan@milton.edu Thu Sep 25 05:56:18 2003
Message-id:
Date: Thu, 25 Sep 2003 08:36:20 -0400
Subject: Re: Unmixing
To: tap-l@listproc.appstate.edu
From: "Jim Kernohan"
References: <5.1.1.6.0.20030924171537.01c29980@postoffice.brown.edu>
<3F726297.8267DC1@mailaps.org>
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Where can a find cylinders to do this demo?

James C. Kernohan
Ayer Observatory
Milton Academy
Milton, MA 02186

'In a way science is a key to the gates of heaven, and the same key opens
the gates of hell, and we do not have any instructions as to which is
which gate. Shall we throw away the key and never have a way to enter the
gates of heaven? Or shall we struggle with the problem of which is the
best way to use the key?'

Richard Phillips Feynman
(1918-1988)

From edwardsabol@hotmail.com Thu Sep 25 06:06:15 2003
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From: "Edward Sabol"
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Subject: Re: Unmixing
Date: Thu, 25 Sep 2003 12:49:35 +0000
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I just clicked on your friends link and have faces for the folks I have
gained insight form thanks


>From: Gerald Zani
>Reply-To: tap-l@listproc.appstate.edu
>To: tap-l@listproc.appstate.edu
>Subject: Unmixing
>Date: Wed, 24 Sep 2003 17:18:29 -0400
>
>Tappers,
>
>When I do the Unmixing demo (see link below to Dick's description) with
>Glycerin and dye I have trouble with heavy smearing when I unmix.
>
>http://www.physics.umd.edu/lecdem/services/demos/demosf4/f4-12.htm
>
>Any tips would be appreciated. Jerry
>Gerald Zani e-mail: Gerald_Zani@brown.edu
>Manager of Demonstrations phone: (401) 863-3964
>Department of Physics FAX: (401) 863-2024
>Brown University Providence, RI 02912-1843 USA
>
>URL http://www.physics.brown.edu/users/staff/zani/index.html
>URL http://www.physics.brown.edu/Studies/Demo/
>
>Do a little more of that work which you have confessed to be good,
>Which you feel that society and your most Just Judge rightly demand of you.
>Cultivate the tree which you have found to bear fruit in your soil.
>If you have any experiments you would like to try, try them.
>Now's your chance.
>Henry David Thoreau, Journal entry, 1850.
>

_________________________________________________________________
Instant message during games with MSN Messenger 6.0. Download it now FREE!
http://msnmessenger-download.com
From edwardsabol@hotmail.com Thu Sep 25 06:12:39 2003
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From: "Edward Sabol"
To: tap-l@listproc.appstate.edu
Subject: Re: linseed oil (was exothermic/endothermic)
Date: Thu, 25 Sep 2003 12:56:01 +0000
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>From: sampere
>Reply-To: tap-l@listproc.appstate.edu
>To: tap-l@listproc.appstate.edu
>Subject: Re: linseed oil (was exothermic/endothermic)
>Date: Wed, 24 Sep 2003 13:09:42 -0400
>
>Cool, thanks.
>
>We want the stuff to polymerize, that's why we apply it to wood, right?
>Oxidation is the exothermic reaction that causes the increase in
>temperature. So, if we put a balled up rag full of linseed oil into
>glovebox filled with N2, then we wouldn't have to worry about combustion
>because it wouldn't oxidize. But it would still polymerize. Right?
>
>Sam
>
>E.L. Jossem wrote:
>
>>
>>
>>
>>
>>http://ptcl.chem.ox.ac.uk/MSDS/LI/linseed_oil.html
>> Safety (MSDS) data for linseed oil
>>
>>------------------------------------------------------------------------
>>
>>General
>>
>>
>>Synonyms: acid refined linseed oil, flaxseed oil, linseed oil fatty acids,
>>linseed fatty acids glycerin ester, bleached linseed oil, groco, L-310,
>>linseed
>>Molecular formula: (Constituents are glycerides of linolenic, linoleic,
>>oleic, stearic, palmitic and myristic acids.)
>>CAS No: 8001-26-1
>>EINECS No:
>>
>>Physical data
>>
>>Appearance: yellow to dark amber liquid with a paint-like odour
>>Melting point: -19 C
>>Boiling point: 343 C
>>Vapour density:
>>Vapour pressure:
>>Density (g cm-3): 0.93
>>Flash point: 222 C
>>Explosion limits:
>>Autoignition temperature: 343 C
>>
>>
>>
>>Stability
>>
>>Stable, but polymerizes gradually upon exposure to air. Combustible.
>>Incompatible with strong oxidizing agents. Reacts violently with chlorine.
>>Material such as rags impregnated with linseed oil may spontaneously
>>combust after a long induction period due to gradual exothermic reaction
>>with oxygen.
>>
>>
>>Toxicology
>>
>>Skin irritant. May be allergenic.
>>
>>Irritation data
>>(The meaning of any abbreviations which appear in this section is given
>>here.)
>>SKN-HMN 300 mg/3d-I mod.
>>
>>
>>Excerpt from website:

http://www.alan.net/prgfeat/tungoil.html

It appears the oxygen is necessary


The principal drying component in Tung oil is eleostearic acid, a conjugated
octadecatrienoic acid. The oleic acid contained in the fatty oils and
unsaturated fatty acids plays a small part in the drying process as well.
The saturated fatty acids present act only as plasticizers.

The drying of films typically progress in three overlapping steps:

1.) Induction - through a process known as autocatalysis, the oxygen uptake
steadily increases. Factors such as temperature, light and heavy
metals/inhibitors in the oil, affect the overall uptake rate.

2.) Initiation - as the film continues to take up oxygen, its mass
increases. The double bonds in the film begin to rearrange and polar groups
such as hydroxyl and hydroperoxy develop in the film. This leads to the
association of molecules through forces such as hydrogen bonding.

3.) Cross-Linking - As the number of double bonds in the film begin to
diminish, larger molecules form and volatile and non-volatile carbonyl
compounds are generated.

The exact chemical reactions in these steps, as well as the structure of the
film-forming polymers, are not fully understood. The initial autooxidation
step in nonconjugated oils (Linseed), is dehydrogenation of the unsaturated
fatty acid by oxygen, which forms a radical. This starts a radical chain
reaction that increases incrementally with time, leading to the formation of
a hydroperoxide.

At low levels, the hydroperoxides produced during autooxidation decompose to
form free alkoxy and hydroxyl radicals. Higher levels of hydroperoxides form
free radicals through bimolecular disproportionation. The resultant free
radicals react in various ways to accelerate the autooxidation process.

The drying of Tung oil varies considerably from Linseed oil. Tung oil
typically absorbs approximately 12% oxygen (Linseed oil absorbs approx. 16%)
and quickly forms a skin on the surface. Since less oxygen is absorbed, the
viscosity of the oil increases at a faster rate. Unlike the hydroperoxide
formation during autooxidation in Linseed oil, Tung oil forms cyclic
peroxides. (The methyl eleostearate formed has a higher molecular mass than
linoleic acid esters).

The direct attack on the double bonds by oxygen forms cyclic peroxides. The
resultant reaction of the peroxides with allylic methylene groups, leads to
the formation of radicals. This creates a radical chain reaction, that forms
polymers. The molecular mass created is less than that achieved through
Linseed oil polymerization. To speed up the film formation, manufacturers
add driers to the oils.
>>Transport information
>>
>>Non-hazardous for air, sea and road freight.
>>
>>Personal protection
>>
>>Gloves. Adequate ventilation.
>>
>>[Return to Physical & Theoretical Chemistry Lab. Safety home page.]
>>------------------------------------------------------------------------
>>This information was last updated on September 3, 2003. We have tried to
>>make it as accurate and useful as possible, but can take no responsibility
>>for its use, misuse, or accuracy.
>

_________________________________________________________________
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(depending on the local service providers in your area).
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From sampere@physics.syr.edu Thu Sep 25 06:29:15 2003
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Date: Thu, 25 Sep 2003 09:12:26 -0400
From: sampere
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Whenever you have questions like go like "Where can I get ...", the
answer is usually McMaster-Carr. Indeed, they do have them. You can
also check for local suppliers in your yellow pages under plastic. In
my yellow pages, they're listed under Plastics-Rods, Tubes, Sheets,
Etc.-Supply Centers.

Sam

Jim Kernohan wrote:

>Where can a find cylinders to do this demo?
>
>James C. Kernohan
>Ayer Observatory
>Milton Academy
>Milton, MA 02186
>
>'In a way science is a key to the gates of heaven, and the same key opens
>the gates of hell, and we do not have any instructions as to which is
>which gate. Shall we throw away the key and never have a way to enter the
>gates of heaven? Or shall we struggle with the problem of which is the
>best way to use the key?'
>
>Richard Phillips Feynman
>(1918-1988)
>
>
From Gerald_Zani@brown.edu Thu Sep 25 07:06:21 2003

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