7.8 Figure 7.3-4 is the phase diagram for a van der Waals fluid. Within the vapor-liquid coexistence envelope one can draw another envelope representing the limits of supercooling of the vapor and superheating of the liq- uid that can be observed in the laboratory; along each isotherm these are the points for which (F). av T = 0 Obtain this envelope for the van der Waals fluid. This is the spinodal curve. The region between the coexistence curve and the curve just obtained is the metastable re- gion of the fluid. Notice also that the critical point of the fluid is metastable. f 1.4. 1.3 1.2 1.1 1.0 0.9 0.8 0.7 0.6 0.5- 0.4 0.3 0.2 0.1- 0 Critical point Liquid vapor coexistence region. 6 -0.9 7-3 -25 -20 -1.5 -1.0 0.8/ 8 -0.7 9 10 Figure 7.3-4 The van der Waals fluid with the vapor-liquid coexistence region identified.

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Chapter1: Chemical Foundations
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Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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7.8 Figure 7.3-4 is the phase diagram for a van der Waals
fluid. Within the vapor-liquid coexistence envelope one
can draw another envelope representing the limits of
supercooling of the vapor and superheating of the liq-
uid that can be observed in the laboratory; along each
isotherm these are the points for which
OP
av
= 0
T
Obtain this envelope for the van der Waals fluid. This is
the spinodal curve. The region between the coexistence
curve and the curve just obtained is the metastable re-
gion of the fluid. Notice also that the critical point of
the fluid is metastable.
f
1.4
1.3
1.2
1.1 -
1.0
0.9
0.8
0.7
0.6
0.5-
0.4
0.3
0.2
0.1
0
Critical point
Liquid vapor
coexistence
region
3
4
6
-2.5
-20
1-1.5
-1.0
7-09-08
8
0.7-
10
5
&
Figure 7.3-4 The van der Waals fluid with the vapor-liquid coexistence region identified.
Transcribed Image Text:7.8 Figure 7.3-4 is the phase diagram for a van der Waals fluid. Within the vapor-liquid coexistence envelope one can draw another envelope representing the limits of supercooling of the vapor and superheating of the liq- uid that can be observed in the laboratory; along each isotherm these are the points for which OP av = 0 T Obtain this envelope for the van der Waals fluid. This is the spinodal curve. The region between the coexistence curve and the curve just obtained is the metastable re- gion of the fluid. Notice also that the critical point of the fluid is metastable. f 1.4 1.3 1.2 1.1 - 1.0 0.9 0.8 0.7 0.6 0.5- 0.4 0.3 0.2 0.1 0 Critical point Liquid vapor coexistence region 3 4 6 -2.5 -20 1-1.5 -1.0 7-09-08 8 0.7- 10 5 & Figure 7.3-4 The van der Waals fluid with the vapor-liquid coexistence region identified.
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