Date: Fri, 2 Sep 2005 13:09:49 -0400

Author: "Br. R. W. Harris"

Subject: RE: [QUAR]magic fluid possible?


Can you "cheat" fluid B is actually two different fluids B1 and B2 which
are the same color but deinsity b1>density a > density b2

Br. Robert W. Harris
Iona Prep School

> -----Original Message-----
> From:
> [] On Behalf Of Gerald Zani
> Sent: Friday, September 02, 2005 12:00 PM
> To:
> Subject: [QUAR]magic fluid possible?
> Tappers,
> I received this question and I want to ask Tappers if you do
> this demo or
> if you think it can be done:
> >Do you have a demonstration showing a fluid "A" injected from below
> >into
> >a fluid "B" and reaching neutral buoyancy at some height
> where fluid A
> >spread horizontally in Fluid B? Do you know what can I use
> to show that?
> >
> >Any tips will be appreciated!
> I don't think this can be done. Certainly a fluid can be
> made to float
> atop another fluid. But because fluids are incompressible I
> don't think
> the effect he wants is possible. Am I right?
> Something like a lava lamp effect can be made rather easily
> using solution
> of alcohol with a salt water. A higher concentration of salt
> water will
> cause the alcohol to float. But it will not rest at some lower level.
> You would need a either a fluid whose density (specific gravity) will
> change with pressure, or you will need a temperature gradient
> in the tank.
> The tank would need to be cool at the top and warm at the
> bottom and in
> this case the neutral buoyancy solution would not be in
> static equilibrium
> but would be constantly cycling up and down from the top
> (cool) to the
> bottom (warm) of the tank like a lava lamp.
> What do you think?
> Your comments please.
> Our driest summer on record here (~2" rain since memorial day
> weekend)
> recently ended with a deluge of 4 inches of rain in two days.
> -- JZ
> Gerald Zani e-mail:
> Manager of Demonstrations phone: (401) 863-3964
> Department of Physics FAX: (401) 863-2024
> Brown University Providence, RI 02912-1843 USA

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

Henry David Thoreau, Journal entry, 1850.

From Fri Sep 2 13:09:45 2005