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The Principles of Thermodynamics
book

The Principles of Thermodynamics

by N.D. Hari Dass
October 2013
Intermediate to advanced content levelIntermediate to advanced
352 pages
13h 56m
English
CRC Press
Content preview from The Principles of Thermodynamics
Phases and Their Equilibria 199
whereas Helium-4 is Bosonic. From a purely thermodynamic perspective, this dis-
tinction can not be made use of. Helium-4 exists in four phases, solid, vapor, and two
liquid phases. There are two triple points and one isolated critical point.
FIGURE 10.7 Helium-4 Phase Diagram.
The accompanying gure displays the
phase diagram of Helium-4. What is to-
tally new from the Helium-3 case is that
now there is a continuous line of criti-
cal points separating the two liquid phases.
This is called the
λ
-transition line because
the specic heat curve at each of these
critical points resembles the greek symbol
λ
. At each of these
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Publisher Resources

ISBN: 9781466512085