Page 238 - Geosystems An Introduction to Physical Geography 4th Canadian Edition

202 part II The Water, Weather, and Climate Systems
TaBle aQS 7.1 psychrometric tables for (a) relative humidity and (b) Dew-point temperature (continued)
(b) Psychrometric Chart of Dew-Point Temperature (°C)
−20.0 −15.0 −10.0
−5.0 0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0 40.0 45.0 50.0
−25 −33
−19 −23 −28
0.5
1.0
Depression of the Wet Bulb (dry-bulb temperature minus wet-bulb temperature, C°)
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
7.5
10.0
12.5
15.0
17.5
20.0
−17.5
−21
−27
−38
−12.5
−15
−18
−22
−29
−12 −14 −7 −8 −1 −3
4 3
9 8
14 13
19 18
24 24
29 29
34 34
39 39
44 44
49 49
−18 −21 −10 −13 −4 −6 2 0 7 6 12 12 18 17 23 22 28 27 33 32 38 38 43 43 48 48
−27 −36 −16 −19 −8 −10 −1 −3 5 4 11 10 16 15 21 21 27 26 32 31 37 36 42 42 47 47
−24 −31 −12 −15 −4 −6 2 1 9 8 14 14 20 19 25 25 31 30 36 35 41 40 46 45
−19 −24
−8 −10 −48
0 −2 −13
7 5 −2 −14
−7.5
−9
−11
−14
−17
−20
−26
−34
−2.5
−4
−6
−7
−9
−11
−14
−17
−22
−28
−41
2.5
1
0
−1
−3
−4
−6
−8
−10
−13
−16
7.5
6
6
4
3
2
1
−1
−2
−4
−6
−22
12.5
12
11
10
9
8
7
6
4
3
2
−7
−28
17.5
17
16
15
14
13
12
12
11
10
8
2
−7
−35
13 12 6 18 18 13 24 23 19 29 28 25 34 34 30 40 39 36 45 44 41
−1 −15
7 0 −14
14 9 2 −11
21 16 11 4
27 23 18 13 6 33 29 25 21 15 38 35 31 28 23
22.5
22
21
20
20
19
18
17
16
16
15
10
3
6
−38
27.5
27
26
26
25
24
23
23
22
21
20
16
11
5
−5
−32
32.5
32
31
31
30
29
29
28
27
26
26
22
18
13
7
−2
37.5
37
36
36
35
34
34
33
32
32
31
28
24
20
15
9
0
42.5
42
41
41
40
40
39
38
38
37
36
33
30
26
22
17
11
47.5
47
46
46
45
45
44
44
43
42
42
39
35
32
28
24
19
TaBle aQS 7.2 Determining Values of relative humidity and Dew-point temperature
1 31 14 17 16 −11 3 1 −3 4 ? −15 5 17.5 ? ? 86 ?
Case
Dry-Bulb Temperature (°C)
Wet-Bulb Temperature (°C)
Wet-Bulb Depression (C°)
Relative Humidity (%)
Dew-Point Temperature (°C)
2
35
25
?
44
21
4
41
28
13
38
?
6
−10
−12
?
?
?
Dry-Bulb Temperature (air temperature, °C)