R H table
Relative Humidity table
(1) Dry Bulb Temperature
(2) Wet Bulb reads oC lower than Dry Bulb
(1) |
(2) |
oC |
01
|
02 |
03
|
04 |
05
|
06 |
07
|
08 |
09 |
10 |
12 |
14 |
16 |
18 |
20 |
02 |
84 |
68 |
52 |
37 |
22 |
08 |
|
|
|
|
|
|
|
|
|
04 |
85
|
70 |
56
|
42 |
29 |
26 |
03 |
|
|
|
|
|
|
|
|
06 |
86 |
73 |
60 |
47 |
34 |
22 |
11 |
|
|
|
|
|
|
|
|
08 |
87 |
75 |
63
|
51 |
39 |
28 |
18 |
07 |
|
|
|
|
|
|
|
10 |
88 |
76 |
65 |
54 |
44 |
33 |
23 |
14 |
04 |
|
|
|
|
|
|
12 |
89 |
78 |
67 |
57
|
47 |
38 |
29 |
20
|
11 |
03 |
|
|
|
|
|
14 |
89 |
79 |
69 |
60 |
51 |
42 |
33 |
25 |
17 |
09 |
|
|
|
|
|
16 |
90 |
80
|
71 |
62 |
54 |
45 |
37 |
29 |
22 |
14 |
|
|
|
|
|
18 |
91 |
81 |
73 |
64 |
56 |
48 |
41 |
33 |
26
|
19 |
06 |
|
|
|
|
20 |
91 |
82
|
74 |
66 |
58 |
51 |
44 |
37 |
30 |
24 |
11 |
|
|
|
|
22 |
91 |
83 |
75 |
68 |
60 |
53 |
46 |
40 |
34 |
27 |
16 |
05 |
|
|
|
24 |
92 |
84 |
76 |
69 |
62 |
55 |
49 |
43 |
37 |
31 |
20 |
09 |
|
|
|
26 |
92 |
85 |
77 |
70 |
64 |
57 |
51 |
45 |
39 |
34 |
23 |
14 |
04 |
|
|
28 |
92 |
85
|
78 |
72 |
65 |
59 |
53 |
47 |
42 |
37 |
26 |
17 |
08 |
|
|
30 |
93 |
86 |
79 |
73 |
67 |
61 |
55 |
49 |
44 |
39 |
29 |
20 |
12 |
04 |
|
32 |
93 |
86 |
80
|
74 |
68 |
62 |
56 |
51 |
46 |
41 |
32 |
23 |
15 |
08
|
01 |
34 |
93 |
87 |
81
|
75 |
69 |
63 |
58 |
53 |
48 |
43 |
34 |
26 |
18 |
11 |
05 |
36 |
93 |
87
|
81 |
75 |
70
|
64 |
59 |
54 |
50 |
45 |
36 |
28 |
21 |
14 |
08 |
38 |
94 |
88 |
82 |
76 |
71 |
65 |
60 |
56 |
51 |
47 |
38 |
31 |
23 |
17 |
11 |
40 |
94 |
88 |
82 |
77 |
72 |
66 |
62 |
57 |
52 |
48 |
40 |
33 |
26 |
19 |
13 |
42 |
94 |
88 |
83 |
77 |
72 |
67 |
63 |
58 |
54 |
50 |
42 |
34 |
28 |
21 |
16 |
44 |
94 |
89 |
82 |
78 |
73 |
68 |
64 |
59 |
55 |
51 |
43 |
36 |
29 |
23 |
18 |
Using the table
Note the dry and wet bulb temperatures. Take the difference between the two.
Under column (1) check the dry bulb temperature and then find the relative
humidity under the appropriate column.
E.g.
In one measure the dry bulb temperature was 32oC
and web bulb was 25oC. The
difference between the two is 3oC
and we see that the RH was 78%.
In another measure the dry bulb
temperature was 28oC and web bulb
was 17oC. The difference between
the two is 11oC but see that
there is no column for this difference. So we interpolate the values and get the
RH to be 31.5% or rounding it to 32%.
Send us your
design (s) or observations - we would be happy to share it with others
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