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For those who don't have red wine in the supply cabinet, you might tr=
y sugar water or salt water with food coloring. Your deparment head =
won't look at you quite as funny when you ask for a signature for sug=
ar!
As a sort of reverse of this rapid change, you might try the opposite=
- put the heavier liquid at the bottom. I filled the bottom half of=
a graduated cylinder with blue sugar water, then carefully add red w=
ater on top. (I used a tube so that I could slowly add the water rig=
ht at thr top of the lower layer without splashing, dropping, stirrin=
g, etc. I was greatly surprised that it took WEEKS for the colors to=
do much mixing. I also took apart a battery tester and added the li=
ttle floating balls which floated in the purple region, slowly separa=
ting as the fluids mixed. =20
I can't remember now what inspired me to try this - if someone else h=
ad suggested it, or if it was a variation on some other demo I saw, o=
r if it was just a random thought. Perhaps I should repeat the exper=
iment and submit it to TPT in a short article.
Tim F=20
-----Original Message-----
=46rom: Forum for Physics Educators on behalf of Brian Whatcott
Sent: Wed 6/23/2004 6:07 PM
>>A glass of red wine, full exactly up to the upper edge.
>>A second glass similarly full of water. A sheet of paper is put jus=
t on
>>the surface, in contact with the edge and with water.
>>
>>Take the second glass in your right hand, maintain the paper sheet =
in
>>place with your left hand, and turn it over, while preventing the w=
ater
>>to flow outside the glass with the paper sheet. Put delicately the =
turned
>>over water glass on the first one, exactly edge against edge.
>>
>>Then, very, very slowly, pull the paper sheet towards you in order =
to
>>remove it completely.
>>
>>Then, very progressively, you see the diffusion of the red wine tow=
ards
>>the upper glass, while it is replaced by water in the lower one. Af=
ter
>>some minutes, the upper glass is full of wine, and the lower is qui=
te
>>clear ! It is really amazing.
>>
>>P. Lauginie