|
Relative Humidity Table for Whirling Psychrometer |
| RELATIVE HUMIDITY TABLES FOR WHIRLING PSYCHROMETER |
|
|
To calculate relative humidity deduct the wet bulb from the dry bulb temperature and read of the difference on the left of the table against the actual dry bulb temperature on the top of the table e.g. Dry Bulb = 29°C & Wet Bulb = 24.5°C Difference = 4.5° at 29°C = 69% RH |
|
DRY BULB READINGS |
| °C |
-5 -4 -3 -2 -1 |
0 1 2 3 4 |
5 6 7 8 9 |
10 11 12 13 14 |
15 16 17 18 19 |
20 21 22 23 24 |
25 26 27 28 29 |
30 31 32 33 34 |
35 36 37 38 39 |
40 41 42 43 44 |
45 46 47 48 49 |
| 0.5 |
88 89 89 90 91 |
91 91 92 92 92 |
93 93 93 94 94 |
94 94 94 95 95 |
95 95 95 95 95 |
96 96 96 96 96 |
96 96 96 96 96 |
97 97 97 97 97 |
97 97 98 98 98 |
98 98 98 98 98 |
98 98 98 98 98 |
| 1.0 |
77 78 79 80 81 |
82 83 84 84 85 |
86 86 87 87 88 |
88 88 89 89 90 |
90 90 90 91 91 |
91 91 92 92 92 |
92 92 92 93 93 |
93 93 93 93 93 |
93 93 93 93 94 |
94 94 94 94 94 |
94 94 94 94 94 |
| 1.5 |
66 67 69 70 72 |
73 75 76 77 78 |
79 79 80 81 82 |
82 83 83 84 84 |
85 85 86 86 86 |
87 87 88 88 88 |
88 88 89 89 89 |
89 89 89 90 90 |
90 90 91 91 91 |
91 91 92 92 92 |
92 92 92 92 92 |
| 2.0 |
54 57 59 61 63 |
65 66 68 69 70 |
72 73 74 75 76 |
76 77 78 79 79 |
80 81 81 82 82 |
83 83 83 84 84 |
84 85 85 85 86 |
86 86 86 86 87 |
87 87 87 88 88 |
88 88 88 88 88 |
89 89 89 89 89 |
| 2.5 |
43 46 49 52 54 |
56 58 60 62 63 |
65 66 67 69 70 |
71 72 73 74 74 |
75 76 77 77 78 |
78 79 80 80 80 |
81 81 81 82 82 |
83 83 83 84 84 |
85 85 86 86 86 |
86 86 86 86 87 |
87 87 87 87 87 |
| 3.0 |
32 36 39 42 45 |
48 50 52 54 56 |
58 60 61 63 64 |
65 66 68 69 70 |
71 71 72 73 74 |
74 75 76 76 77 |
77 78 78 78 79 |
79 79 80 80 80 |
81 81 82 82 82 |
82 83 83 83 83 |
83 84 84 84 84 |
| 3.5 |
26 27 29 33 36 |
39 42 45 47 49 |
51 53 55 57 58 |
60 61 62 64 65 |
66 67 68 69 70 |
70 71 72 72 73 |
74 74 75 75 76 |
76 77 77 77 77 |
78 78 79 79 79 |
79 79 80 80 80 |
80 80 81 81 81 |
| 4.0 |
20 22 23 24 27 |
31 34 37 40 42 |
45 47 49 51 53 |
54 56 57 59 60 |
61 63 64 65 65 |
66 67 68 69 69 |
70 71 71 72 72 |
73 73 74 74 74 |
75 75 76 76 76 |
77 77 78 78 78 |
78 78 79 79 79 |
| 4.5 |
19 19 21 |
24 26 30 33 35 |
38 41 43 45 47 |
49 51 53 54 56 |
58 58 59 61 62 |
63 64 64 65 66 |
67 67 68 68 69 |
70 70 71 71 71 |
72 72 73 73 74 |
74 74 75 75 75 |
75 75 76 76 76 |
| 5.0 |
17 |
18 19 22 26 29 |
32 35 37 40 42 |
44 46 48 49 51 |
52 54 55 56 58 |
59 60 61 62 63 |
63 64 65 65 66 |
67 67 68 68 68 |
69 69 70 70 71 |
71 72 72 73 73 |
73 73 74 74 74 |
|
| 5.5 |
|
15 17 20 23 |
24 29 31 34 36 |
39 41 43 45 46 |
48 50 51 53 54 |
55 56 57 58 59 |
60 61 62 62 63 |
64 64 65 66 66 |
66 67 67 67 68 |
68 69 69 69 70 |
70 70 71 71 71 |
| 6.0 |
|
15 17 |
19 23 26 29 31 |
34 36 38 40 42 |
44 46 47 49 50 |
51 52 54 55 56 |
57 58 59 59 60 |
61 61 62 63 64 |
64 64 65 65 66 |
66 67 67 68 68 |
68 68 69 69 70 |
| 6.5 |
|
|
15 18 20 23 26 |
29 31 33 36 38 |
40 42 43 45 46 |
48 49 50 51 53 |
54 55 55 56 57 |
58 59 60 60 61 |
61 61 62 62 63 |
63 64 64 65 65 |
65 66 66 66 67 |
| 7.0 |
|
|
10 12 14 18 21 |
24 26 29 31 33 |
36 37 39 41 43 |
44 46 47 48 49 |
50 52 52 53 54 |
55 55 56 58 58 |
59 59 60 60 61 |
61 62 62 63 63 |
64 64 65 65 66 |
| 7.5 |
|
|
10 13 16 |
19 22 24 27 29 |
32 34 36 37 39 |
41 42 44 45 46 |
47 48 50 50 51 |
52 53 54 55 56 |
56 57 58 58 58 |
59 59 60 60 61 |
62 62 62 62 63 |
| 8.0 |
|
|
11 |
14 17 20 23 25 |
27 30 32 34 36 |
37 39 40 42 43 |
44 46 47 48 49 |
50 50 51 52 53 |
54 55 55 56 57 |
57 57 58 58 59 |
59 60 60 61 61 |
| 8.5 |
|
|
|
10 12 16 18 21 |
23 26 28 30 32 |
34 36 37 39 40 |
41 43 44 45 46 |
47 48 49 50 51 |
51 52 53 53 54 |
54 55 56 56 57 |
57 57 58 58 58 |
| 9.0 |
|
|
|
11 14 17 |
20 22 24 27 29 |
30 32 34 36 37 |
38 40 41 42 43 |
44 45 46 47 47 |
49 50 51 51 52 |
52 53 54 54 55 |
55 56 56 57 57 |
| 9.5 |
|
|
|
12 |
16 18 21 23 25 |
27 29 31 33 34 |
36 37 38 40 41 |
42 43 44 45 46 |
47 48 48 48 50 |
50 51 51 52 53 |
53 54 54 55 55 |
| 10.0 |
|
|
|
|
12 15 17 20 22 |
24 26 28 30 31 |
33 34 36 37 38 |
39 40 41 42 42 |
44 45 46 46 48 |
48 49 49 50 51 |
51 52 52 53 53 |
|
|