.
This leads to the result that the viscosity at the
melting point is independent of pressure.
Thus the viscosity of iron at the ICB should be about
equal to the viscosity at room pressure, 
, or
about 
.
Acknowledgments. I thank Stanislav Braginsky and Paul Roberts
for permitting me to see their manuscript before
publication and for their suggestions. I am
grateful to Jean-Paul Poirier, Frank Stacey,
and two unknown reviewers for comments on
an early version of the typescript. I thank
Dave Young for help in finding the freezing
point depression from impurities. I am
grateful to Tom Ahrens for sending
information on his revised measurements
of 
. I thank Don Isaak
for his calculations of 
of fcc iron.
This study was made possible by a collaborative
IGPP (LANL, LLNL, and UCLA) effort of T.J. Shankland,
Al Duba, and myself over five years, resulting
in the two ironworkers conventions, the
joint IGPP publication called, ``The Physics of Iron,''
and the two papers referenced to Duba. I am indebted to
Charles Alcock, who provided support for the
writing of this study through the IGPP at the
Lawrence Livermore National Laboratory (LLNL)
under the University Collaborative Research
Program project # 93--11 under contract W--7405--ENG--48
of the Department of Energy. IGPP-UCLA paper no. 4205