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DJJ20063- Thermodynamics 1
Saturated liquid line
T
Dry saturated steam
Critical
P2 = const.
point
P2 > P1
COMPRESS
P1 = const.
LIQUID
REGION SUPERHEATED
STEAM
REGION
WET STEAM
REGION
v
Figure 2.2.3-2 T-v diagram of a pure substance
The general shape of the P-v diagram of a pure substance is very much like the T-v
diagram, but the T = constant lines on this diagram have a downward trend, as shown in
Fig. 2.2.3-3.
Saturated liquid line
P
Dry saturated steam
Critical
point
SUPERHEATED
STEAM
REGION
COMPRESS
LIQUID T2 = const.
REGION WET STEAM T2 > T1
REGION T1 = const.
v
Figure 2.1.3-3 P-v diagram of a pure substance
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