Indeed, fluids do have bulk moduli. In fact, the longitudinal speed of
sound in a fluid is given by the square root of the ratio (bulk
modulus/mass density).

Thomas E. Wilson
Professor of Physics and Physical Science
Marshall University
One John Marshall Drive
Huntington, WV  25755-2570
Telephone: 304.696.2752
FAX: 304.696.3243

"Four thousand holes in Blackburn, Lancashire
And though the holes were rather small
They had to count them all
Now they know how many holes it takes to fill the Albert Hall [Effect]"
- condensed-matter theorists Lennon and McCartney.



-----Original Message-----
From: mems-talk-bounces@memsnet.org
[mailto:mems-talk-bounces@memsnet.org] On Behalf Of Jeff Zahn
Sent: Monday, December 13, 2004 9:45 AM
To: General MEMS discussion
Subject: Re: [mems-talk] Bulk Modulus PDMS (in liquid form)

A fluid by definition will not have a bulk modulus
since it will deform instantanuously and irreviersibly
when exposed to a shear. It will however, have a
viscosity which determines how much it will deform
when exposed to a shear. If it is viscoelastic it will
have both a storage (elastic) and loss (viscous)
modulus.

--- "Nathan L. Tyson"  wrote:

> Dear Sirs,
>       I am using Gelest PDMS (trimethylsiloxy terminated)
> Silicone Oil (5cSt.)in
> my research and have been unsuccessful in locating
> an estimate (or better
> if possible) of the Bulk Modulus of this oil (not
> crosslinked, but rather
> BM of material in liquid form). I assume that this
> property is temperature
> dependent, and if so, could you give me an idea of
> how radically its value
> varies with temperature? I am using it at 20C and so
> the BM at this temp
> would be most useful. Thanks for your time and
> assistance. I look forward
> to your response.
> Cheers,
> Nathan L. Tyson
> _______________________________________________
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>
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>




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