Moisture Conversion Table
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1Moisture Conversion Table
Vapor Pressure
PPM on Volume
Dew Point
(Water/Ice in Equilibrium)
Basis at 760 mm
Relative Humidity
PPM on Weight
°C
°F
mm of Mercury
of Hg Pressure
at 70°F%
Basis in Air
-90
-130
0.00007
0.0921
0.00037
0.057
-88
-126
0.00010
0.132
0.00054
0.082
-86
-123
0.00014
0.184
0.00075
0.11
-84
-119
0.00020
0.263
0.00107
0.16
-82
-116
0.00029
0.382
0.00155
0.24
-80
-112
0.00040
0.562
0.00214
0.33
-78
-108
0.00056
0.737
0.00300
0.46
-76
-105
0.00077
1.01
0.00410
0.63
-74
-101
0.00105
1.38
0.00559
0.86
-72
-98
0.00143
1.88
0.00762
1.17
-70
-94
0.00194
2.55
0.0104
1.58
-68
-90
0.00261
3.43
0.0140
2.13
-66
-87
0.00349
4.59
0.0187
2.84
-64
-83
0.00464
6.11
0.0248
3.79
-62
-80
0.00614
8.08
0.0328
5.01
-60
-76
0.00808
10.6
0.0430
6.59
-58
-72
0.0106
13.9
0.0565
8.63
-56
-69
0.0138
18.2
0.0735
11.3
-54
-65
0.0178
23.4
0.0948
14.5
-52
-62
0.0230
30.3
0.123
18.8
-50
-58
0.0295
38.8
0.157
24.1
-48
-54
0.0378
49.7
0.202
30.9
-46
-51
0.0481
63.3
0.257
39.3
-44
-47
0.0609
80
0.325
49.7
-42
-44
0.0768
101
0.410
62.7
-40
-40
0.0966
127
0.516
78.9
-38
-36
0.1209
159
0.644
98.6
-36
-33
0.1507
198
0.804
122.9
-34
-29
0.1873
246
1.00
152
-32
-26
0.2318
305
1.24
189
-30
-22
0.2859
376
1.52
234
-28
-18
0.351
462
1.88
287
-26
-15
0.430
566
2.3
351
-24
-11
0.526
692
2.81
430
-22
-8
0.640
842
3.41
523
-20
-4
0.776
1020
4.13
633
-18
0
0.939
1240
5.00
770
-16
3
1.132
1490
6.03
925
-14
7
1.361
1790
7.25
1110
-12
10
1.632
2150
8.69
1335
-10
14
1.950
2570
10.4
1596
-8
18
2.326
3060
12.4
1900
-6
21
2.765
3640
14.7
2260
-4
25
3.280
4320
17.5
2680
-2
28
3.880
5100
20.7
3170
0
32
4.579
6020
24.4
3640
2
36
5.294
6970
28.2
4330
4
39
6.101
8030
32.5
4990
6
43
7.013
9230
37.4
5730
8
46
8.045
10590
42.9
6580
10
50
9.029
12120
49.1
7530
12
54
10.52
13840
56.1
8600
14
57
11.99
15780
63.9
9800
16
61
13.63
17930
72.6
11140
18
64
15.48
20370
82.5
12650
20
68
17.54
23080
93.5
14330
185
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