This document is a psychrometric chart that displays temperature, humidity, enthalpy, and other psychrometric properties of air at various saturation temperatures and relative humidities. The chart shows lines of constant dry bulb temperature, wet bulb temperature, relative humidity, enthalpy, specific volume, and humidity ratio. It can be used to determine air properties or conditions given certain measurements or specifications.

1. 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
E
N
T
H
A
L
P
Y
-
B
T
U
P
E
R
P
O
U
N
D
O
F
D
R
Y
A
I
R
S
A
T
U
R
A
T
I
O
N
T
E
M
P
E
R
A
T
U
R
E
-
°
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%
8
0
%
9
0
%
1
2
.
5
1
3
.
0
1
3
.
5
1
4
.
0
S
P
E
C
I
F
I
C
V
O
L
U
M
E
f
t
³
/
lb
O
F
D
R
Y
A
I
R
1
4
.
5
1
5
.
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
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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