Relative Humidity, Percentage Vs. Temperature (Degree Fahrenheit)

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Relative Humidity, Percentage vs. Temperature (Degree Fahrenheit)
HYGROMETERS AND PSYCHROMETERS
Pressure equals 101.313 kPa
These instruments consist of two liquid-in-glass thermometers; the dry bulb which measures the actual air
Air
Depression of wet-bulb thermometer (t - t’)
temperature, and the wet bulb which measures the water vapor in the air. The wicking attached to the
emp
wet bulb thermometer must be immersed in clean water so that the bulb is completely saturated. Care
t
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0 10.5
must be taken that the wick does not become dirty or it will not absorb water, and give inaccurate
20
93
86
79
72
65
58
51
44
38
31
24
18
11
4
readings.
21
93
86
80
73
66
59
53
46
40
33
27
20
14
7
1
22
93
87
80
74
67
61
54
48
41
35
29
23
16
10
4
The difference between the dry bulb and the wet bulb readings is known as the depression. The
23
94
87
81
74
68
62
56
49
43
37
31
25
19
13
7
1
1
depression is indicated on the chart in the horizontal column at the top, and the air or dry bulb
24
94
87
81
75
69
63
57
51
45
39
33
27
21
16
10
4
4
temperature is indicated at the left side vertical column. To determine percent of relative humidity, first
determine the dry bulb temperature and then the depression. The intersection of both columns is the
25
94
88
82
76
70
64
58
52
46
41
35
29
24
18
12
7
7
percent of relative humidity. For example, if the dry bulb reading is 100 °F, and the wet bulb reading is
26
94
88
82
77
71
65
59
54
48
42
37
31
26
20
15
10
10
90 °F, which is a depression of 10°, the relative humidity is 68%, as indicated on the chart.
27
94
89
83
77
72
66
60
55
49
44
39
33
28
23
17
12
12
2
28
94
89
83
78
72
67
62
56
51
46
40
35
30
25
20
15
15
5
0
Where sling psychrometers are used, it is necessary to whirl the instrument for about ten seconds, two or
29
95
89
84
78
73
68
63
57
52
47
42
37
32
27
22
17
17
7
2
three times, until there is no further drop in temperature, before readings are taken.
30
95
89
84
79
74
69
64
59
54
49
44
39
34
29
24
19
19
10
5
0
31
95
90
85
80
74
70
65
60
55
50
45
40
36
31
26
21
21
12
8
3
32
95
90
85
80
75
70
65
61
56
51
47
42
37
33
28
24
24
15
10
6
1
33
95
90
85
81
76
71
66
62
57
52
48
43
39
34
30
26
26
17
12
8
4
34
95
90
86
81
76
72
67
63
58
54
49
45
40
36
32
27
27
19
15
11
6
t
11.0 11.5 12.0 12.5 13.0 13.5 14.0 14.5 15.0 15.5 16.0 16.5 17.0 17.5 18.0 18.5 19.0 19.5 20.0 20.5 21.0
35
95
91
86
82
77
72
68
64
59
55
50
46
42
38
33
29
29
21
17
13
9
35
5
1
36
95
91
86
82
78
73
69
64
60
56
52
48
43
39
35
31
31
23
19
15
11
36
7
3
37
96
91
87
82
78
74
70
65
61
57
53
49
45
41
37
33
33
25
21
17
13
37
9
6
2
38
96
91
87
83
79
74
70
66
62
58
54
50
46
42
38
34
34
27
23
19
15
38
12
8
4
1
39
96
92
87
83
79
75
71
67
63
59
55
51
47
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40
36
36
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25
21
17
39
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3
0
40
96
92
88
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41
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23
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40
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12
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2
41
96
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28
25
21
41
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14
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4
1
42
96
92
88
84
80
77
73
69
65
62
58
54
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44
40
40
33
30
26
23
42
20
16
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10
6
3
0
43
96
92
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73
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63
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42
42
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31
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1
50
97
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90
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83
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77
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71
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52
49
49
44
41
38
35
50
32
30
27
24
21
19
16
13
11
8
5
3
0
51
97
93
90
87
84
81
77
74
71
68
65
62
59
56
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50
50
45
42
39
36
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34
31
28
26
23
20
18
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10
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5
2
0
52
97
94
90
87
84
81
78
75
72
69
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51
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43
40
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32
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27
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22
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53
97
94
91
87
84
81
78
75
72
69
66
64
61
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52
52
47
44
41
39
53
36
34
31
28
26
23
21
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16
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11
9
6
4
1
54
97
94
91
88
85
82
79
76
73
70
67
64
61
59
56
53
53
48
45
43
40
54
37
35
32
30
27
25
22
20
17
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13
10
8
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3
1
55
97
94
91
88
85
82
79
76
73
70
68
65
62
59
57
54
54
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46
44
41
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38
36
33
31
29
26
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19
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14
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1
56
97
94
91
88
85
82
79
77
74
71
68
65
63
60
57
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55
50
47
45
42
56
40
37
35
32
30
27
25
23
20
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16
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2
0
57
97
94
91
88
85
83
80
77
74
71
69
66
63
61
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56
56
51
48
46
43
57
41
38
36
33
31
29
26
24
22
20
17
15
13
11
9
6
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2
0
58
97
94
91
88
86
83
80
77
75
72
69
67
64
61
59
56
56
51
49
46
44
58
42
39
37
35
32
30
28
25
23
21
19
17
14
12
10
8
6
4
2
0
59
97
94
91
89
86
83
80
78
75
72
70
67
65
62
60
57
57
52
50
47
45
59
43
40
38
36
33
31
29
27
25
22
20
18
16
14
12
10
8
6
4
2
0
60
97
94
92
89
86
83
81
78
75
73
70
68
65
63
60
58
58
53
51
48
46
60
44
41
39
37
35
32
30
28
26
24
22
19
17
15
13
11
9
7
5
3
1
61
97
94
92
89
86
84
81
78
76
73
71
68
66
63
61
58
58
54
51
49
47
61
44
42
40
38
36
33
31
29
27
25
23
21
19
17
15
13
11
9
7
5
3
62
97
95
92
89
87
84
81
79
76
74
71
69
66
64
62
59
59
54
52
50
48
62
45
43
41
39
37
34
32
30
28
26
24
22
20
18
16
14
12
10
8
7
5
63
97
95
92
89
87
84
82
79
77
74
72
69
67
64
62
60
60
55
53
51
48
63
46
44
42
40
38
36
33
31
29
27
25
23
21
19
17
16
14
12
10
8
6
64
97
95
92
89
87
84
82
79
77
75
72
70
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63
60
60
56
54
51
49
64
47
45
43
41
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34
32
30
28
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23
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19
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11
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85
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42
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97
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90
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85
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76
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43
41
39
37
35
34
32
30
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22
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68
97
95
93
90
88
85
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76
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63
63
58
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54
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68
50
48
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44
42
40
38
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31
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17
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98
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93
90
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76
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63
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59
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43
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86
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t
1
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9
7
6
4
3
1
0
104
97
93
90
87
83
80
77
74
72
69
66
63
61
58
55
53
51
48
46
44
41
39
37
35
33
31
29
27
25
23
22
20
18
16
15
13
12
10
9
7
6
4
3
1
0
106
97
93
90
87
84
81
78
75
72
69
66
64
61
59
56
54
51
49
47
44
42
40
38
36
34
32
30
28
26
25
23
21
19
18
16
15
13
11
10
8
7
6
4
3
2
108
97
93
90
87
84
81
78
75
72
70
67
64
62
59
57
54
52
50
47
45
43
41
39
37
35
33
31
29
27
26
24
22
21
19
17
16
14
13
11
10
8
7
6
4
3
110
97
93
90
87
84
81
78
76
73
70
67
65
62
60
57
55
53
50
48
46
44
42
40
38
36
34
32
30
28
27
25
23
22
20
19
17
15
14
13
11
10
8
7
6
5
112
97
94
90
87
84
82
79
76
73
70
68
65
63
60
58
56
53
51
49
47
45
43
41
39
37
35
33
31
29
28
26
24
23
21
20
18
17
15
14
12
11
10
8
7
6
114
97
94
91
88
85
82
79
76
74
71
68
66
63
61
59
56
54
52
50
47
45
43
41
39
38
36
34
32
30
29
27
25
24
22
21
19
18
16
15
14
12
11
10
8
7
116
97
94
91
88
85
82
79
77
74
71
69
66
64
61
59
57
55
52
50
48
46
44
42
40
38
37
35
33
31
30
28
26
25
23
22
20
19
17
16
15
13
12
11
10
8
118
97
94
91
88
85
82
79
77
74
72
69
67
64
62
60
57
55
53
51
49
47
45
43
41
39
37
36
34
32
31
29
27
26
24
23
21
20
18
17
16
15
13
12
11
10
120
97
94
91
88
85
82
80
77
75
72
69
67
65
62
60
58
56
54
51
49
47
45
44
42
40
38
36
35
33
31
30
28
27
25
24
22
21
19
18
17
16
14
13
12
11
122
97
94
91
88
85
83
80
77
75
72
70
67
65
63
61
58
56
54
52
50
48
46
44
42
41
39
37
35
34
32
31
29
28
26
25
23
22
20
19
18
17
15
14
13
12
124
97
94
91
88
86
83
80
78
75
73
70
68
66
63
61
59
57
55
53
51
49
47
45
43
41
40
38
36
35
33
31
30
28
27
25
24
23
21
20
19
18
16
15
14
13
126
97
94
91
88
86
83
80
78
75
73
71
68
66
64
61
59
57
55
53
51
49
47
46
44
42
40
39
37
35
34
32
31
29
28
26
25
24
22
21
20
18
17
16
15
14
128
97
94
91
89
86
83
81
78
76
73
71
69
66
64
62
60
58
56
54
52
50
48
46
44
43
41
39
38
36
34
33
31
30
28
27
26
24
23
22
21
19
18
17
16
15
130
97
94
91
89
86
83
81
78
76
74
71
69
67
64
62
60
58
56
54
52
50
49
47
45
43
42
40
38
37
35
34
32
31
29
28
26
25
24
23
21
20
19
18
17
16
132
97
94
92
89
86
84
81
79
76
74
72
69
67
65
63
61
59
57
55
53
51
49
47
46
44
42
40
39
37
36
34
33
31
30
29
27
26
25
23
22
21
20
19
17
16
134
97
94
92
89
86
84
81
79
76
74
72
70
67
65
63
61
59
57
55
53
51
50
48
46
44
43
41
40
38
36
35
33
32
31
29
28
27
25
24
23
22
21
19
18
17
136
97
94
92
89
87
84
82
79
77
74
72
70
68
66
64
61
59
58
56
54
52
50
48
47
45
43
42
40
39
37
36
34
33
31
30
29
27
26
25
24
22
21
20
19
18
138
97
95
92
89
87
84
82
79
77
75
72
70
68
66
64
62
60
58
56
54
52
51
49
47
45
44
42
41
39
38
36
35
33
32
31
29
28
27
26
24
23
22
21
20
19
140
97
95
92
89
87
84
82
80
77
75
73
71
68
66
64
62
60
58
56
55
53
51
49
48
46
44
43
41
40
38
37
35
34
33
31
30
29
27
26
25
24
23
22
21
19
RHF-01 8/01

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