20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120
DRY BULB TEMPERATURE - °F
10
20
30
40
50
60
70
80
90
100
110
120
130
140
150
160
170
180
190
200
210
10
15
20
25
30
35
40
45
50
55
55
60
60
65
ENTHALPY - BTU PER POUND OF DRY AIR
10
15
20
25
30
35
40
45
50
ENTHALPY - BTU PER POUND OF DRY AIR
SATURATION TEMPERATURE - °F
20
25
25
30
30
35
35
40
40
45
45
50
50
55
55
60
60
65
65
70
70
75
75
80
80
85 WET BULB TEMPERATURE - °F
85
90
10% RELATIVE HUMIDITY
20%
30%
40%
50%
60%
70%
80%
90%
12.5
13.0
13.5
14.0 SPECIFIC VOLUME ft³/lb OF DRY AIR
14.5
15.0
HUMIDITY RATIO - GRAINS OF MOISTURE PER POUND OF DRY AIR
PSYCHROMETRIC CHART
BAROMETRIC PRESSURE 29.921 inches of Mercury
Linric Company Psychrometric Chart, www.linric.com
.1
.2
.3
.4
.5
.6
.7
.8
.9
1
1.1
1.2
1.3
VAPOR PRESSURE - INCHES OF MERCURY
-20
0
10
20
25
30
35
40
45
50
55
60
65
70
75
80
85
DEW POINT - °F