This document is a psychrometric chart that shows temperature, humidity, and other thermodynamic properties of air at various conditions. The chart maps dry bulb temperature on the y-axis against enthalpy or wet bulb temperature on the x-axis. Lines of constant relative humidity, specific volume, humidity ratio, vapor pressure, and dew point are indicated. Key parameters like barometric pressure, units, and source are provided.

1. -10 -5 0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100 105 110 115 120 125 130
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
70
ENTHALPY
-
BTU
PER
POUND
OF
DRY
AIR
0
5
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
-5
0
0
5
5
10
10
15
15
20
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
W
ET
BULB
TEM
PERATURE
- °F
85
90
1
5
%
2
5
%
2%
4%
6%
8%
10% RELATIVE HUMIDITY
20%
30%
40%
50%
6
0
%
7
0
%
8
0
%
9
0
%
1
2
.0
1
2
.5
1
3
.0
1
3
.5
1
4
.0
S
P
E
C
IF
IC
V
O
L
U
M
E
ft
³/
lb
O
F
D
R
Y
A
IR
1
4
.5
1
5
.0
1
5
.5
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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.2
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.4
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.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