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CHAP. 4]
PROPERTIES OF PURE SUBSTANCES
p
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Fig. 4-1
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-
•
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- ---
/
CHAPTER
3.
Vo lume tr ic
PVDiagram
Figure 3.1 does not provide any information about volume; it merely
aries on a PT diagram. On a P V diagram [Fig. 3.2(a)] these bounda
where two phases- solidlliquid, solid/vapor, and liquid/vapor- co
regions are separated by bounding curves that represent single phas
which determine the molar (or specific) volumes at intermediate
Fig. 3.1 here becomes a horizontal line, where the three phases coe
and pressure.
Fluid
Solid/liquid
~ T,
I
I
I
:2 \ C
: : : J ,
a ------------------ P
~ .... c
',Gas
.. .
. . .
,
. . . . . .
Vapor ...~
To
p
p
Solid/Vapor
v
a
(b
Figure 3_2:P V diagrams for a
pure
substance. (a) Showingsolid, liquid, a
liquid, liquid/vapor,and vaporregions
with
isotherms.
Figure 3.2(b) shows the liquid, liquid/vapor, and vapor region
four isotherms superimposed. Isotherms on Fig. 3.1 are vertical
greater than
Tc
do not cross a phase boundary. On Fig.
3.2(b)
the i
therefore smooth.
The lines labeled
T l
and
T2
are for subcritical temperatures,
ments. The horizontal segment of each isotherm represents all poss
vapor in equilibrium, ranging from 100% liquid at the left end to 10
The locus of these end points is the dome-shaped curve labeled BC
(from
B
to C) represents single-phase liquids at their vaporization (
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