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Re: liquid helium data needed



At 13:11 5/17/99 -0700, you wrote:
I'm trying to write a couple of problems on liquid helium and my
library doesn't seem to have the data I need. Could someone with
the right references at hand look up the following for me?

1. Molar volume (or density) of solid and liquid helium-3 near the
melting curve, near or below 0.3 K. (So I can test the Clausius-
Clapeyron equation...)

2. Density, speed of sound, and specific heat of helium-4 below 0.6 K,
at any (consistent) pressure. (So I can test the Debye model.)

Thanks!

Dan Schroeder


Picking some (perhaps relevant) numbers out of ref 1:

Isothermal compressibility of liquid and solid phase of 3He
are nearly equal at 9.17 x 10^-3 bars^-1 - 1.27 x 10^-4 p bars^-2
at 20 mK in zero magnetic field applied.

Molar volume DIFFERENCE between liq and solid 3He:
vl - vs = 1.314 cm^3/mole (accuracy 1.5%)

Specific heat at superfluid phases, zero mag field at melting pressure
per T/TsubC varies from 0.4 x 10^3 erg/mK mole at T/Tc = 0.5
1.3 10^3 at 0.791 B transition
2.8 10^3 1.0

from graph fig 4.20 after Halperin et al.

I expect you would find this Wiley monograph in
"The Physics of Liquid and Solid Helium, part II Bennemann & Ketterson
ISBN 0-471-06601-x" (ref 1)
- a lot more exciting than I do :-)

Brian

brian whatcott <inet@intellisys.net>
Altus OK