Masonry Magazine August 1988 Page. 20
TABLE 1
Pressure of Water Vapor at Saturation
Note: To Convert Pressure in Inches of Mercury (In. Hg) to psi; (0.49116) (In. Hg) = psi
Saturated Vapor Pressure and Actual Vapor Pressure
TEMPERATURE °F
Saturated Vapor
Temp. °F
Pressure In. Hg
-20
.01259
-19
.01333
-18
.01411
-17
.01493
-16
.01579
-15
.01671
-14
.01767
-13
.01868
-12
.01974
-11
.02006
-10
.02203
-9
.02327
8
.02457
9
.02594
10
.02738
11
.02889
12
.03047
13
.03214
14
.03388
15
.03572
16
.03764
17
.03967
18
.04178
19
.04401
20
.04634
21
.04878
22
.05134
23
.05402
24
.05683
25
.05978
26
.06286
27
.06608
28
.06946
29
.07300
30
.07670
31
.08056
32
.08461
33
.08884
34
.09327
35
.09789
36
.10272
37
.10777
38
.11305
39
.11856
40
.12431
41
.13032
42
.13659
43
.14313
44
.14966
45
.15709
46
.16452
47
.17227
48
.18035
49
.18778
50
.19456
51
.20342
52
.21166
53
.22020
54
.22904
55
.23819
56
.24767
Saturated Vapor
Temp. °F
Pressure In. Hg
41
.25748
42
.26763
43
.27813
44
.28899
45
.30023
46
.31185
47
.32386
48
.33629
49
.34913
50
.36240
51
.37611
52
.39028
53
.40492
54
.42004
55
.43565
56
.45176
57
.46840
58
.48558
59
.50330
60
.52159
61
.54047
62
.55994
63
.58002
64
.60073
65
.62209
66
.64411
67
.66681
68
.69019
69
.71430
70
.73915
71
.76475
72
.79112
73
.81828
74
.84624
75
.87504
76
.90470
77
.93523
78
.96665
79
.99899
80
1.0323
81
1.0665
82
1.1017
83
1.1379
84
1.1752
85
1.2135
86
1.2529
87
1.2934
88
1.3351
89
1.3779
90
1.4219
91
1.4671
92
1.5135
93
1.5612
94
1.6102
95
1.6606
96
1.7123
97
1.7654
98
1.8199
99
1.8759
100
1.9333
FIG. 2
Temperature Gradient
FIG. 3
Saturated Vapor Pressure and Actual Vapor Pressure