Pounds of moisture
per pound of dry air
`
Grains of moisture
per pound of dry air
`
PSYCHROMETRIC
CHART
Normal Temperature
I-P Units
SEA LEVEL
180
BAROMETRIC PRESSURE: 29.921 in. HG
.025
45
170
.024
0.40
.023
160
80
.022
40
150
.021
140
.020
14.5
75
0.50
.019
Btu
90%
35
-0.1
130
.018
-0.2 B
tu
80%
120
70
30
0.45
0.55
.017
0.60
.016
110
0.65
.015
60
%
OF
D
UN
PE
tu
TU
2B
-B
-.08
Btu
-.06
Btu
-.04
Btu
-.0
LP
Y
-0.3 Btu - Enthalpy deviation Btu per pound of dry air
R
PO
IR
RY A
LB. D
%
40
45
30%
40
.011
70
13.0
0.1
25
.009
.008
50
.007
.006
40
.005
30
20%
.004
Btu
0.2
Btu
`
12.5
Wet-Bulb
Dewpoint or
Saturation
Temperature F
.010
60
35
30
10%
Btu
.003
20
MIDITY
0.3
E HU
RELATIV
.002
10
tu
.4 B
0
.001
0
`
Dry-Bulb
20
Temperature F
25
30
35
40
Below 32 F, properties and enthalpy deviation lines are for ice.
45
50
55
60
65
70
75
80
85
0.80
90
95
100
0.90
0.95
1.00
`
PER
5
13.5
50
.FT.
TH
A
80
- CU
EN
.012
UME
55
0%
0.75
0.85
VOL
20
.013
90
14.0
60
15
10
.014
65
25
DR
Y
AI
R
70
%
0.70
100
105
110
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
.000
Sensible
Heat
Factor
PSYCHROMETRIC
CHART
Normal Temperature
SI Units
SEA LEVEL
90
BAROMETRIC PRESSURE: 101.325 kPa
24
.024
22
.022
0.35
80
0.40
70
25
20
.020
18
16
90%
50
80
40
14
0.88
%
20
R
70
15
%
K
0.86
60
-K
L
HA
20
C
ME -
T
EN
10
U
VOL
PY
O
AM
GR 3
O
0
IL
%
UBIC
50
10
8
E
ER P
MET
0.84
%
40
R KG
10
.012
.010
.008
6
.006
4
.004
2
.002
AIR
0.82
30%
0
0
.014
DRY
5
.016
0.80
20%
-5
0.78
MIDITY
TIVE HU
10% RELA
0.76
0
-10
-5
0
Below 32 F, properties and enthalpy deviation lines are for ice.
5
10
15
20
25
30
35
40
Chart by: HANDS DOWN SOFTWARE, www.handsdownsoftware.com
.000
0.50
0.55
0.60
0.65
0.70
0.75
0.80
0.85
0.90
0.95
1.00
`
R
E
JP
12
%
Y
R
FD
AI
.018
HUMIDITY RATIO - KILOGRAMS MOISTURE PER KILOGRAM DRY AIR
0.90
60
HUMIDITY RATIO (or Specific Humidity) GRAMS OF MOISTURE PER KILOGRAM OF DRY AIR
0.45
Sensible
Heat
Factor