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# Air - Maximum Moisture Carrying Capacity

## Maximum water content in humid air vs. temperature.

The maximum moisture content possible in air - at saturation - varies with temperature. The table below indicates maximum moisture content in a cubic metre of air at various temperatures:

TemperatureMax.
Water Content
(oC)(oF)(10-3 kg/m3)(10-3 lb/ft3)
-25 -13 0.64 0.040
-20 -4 1.05 0.066
-15 5 1.58 0.099
-10 14 2.31 0.14
-5 23 3.37 0.21
0 32 4.89 0.31
5 41 6.82 0.43
10 50 9.39 0.59
15 59 12.8 0.8
20 68 17.3 1.07
30 86 30.4 1.9
40 104 51.1 3.2
50 122 83.0 5.2
60 140 130 8.1
• 10-3 kg/m3 = g/m3

### Example - Moisture Carrying Capacity in Heated Air

Air is heated from 20oC to 50oC.

• from the table above the maximum moisture content in air at 20oC is 17.3 g/m3, and
• the maximum moisture content in air with temperature 50oC is 83 g/m3

The increased ability to carry moisture can be calculated as

100 % ((83 g/m3) - (17.3 g/m3)) / (17.3 g/m3)

= 380 %

This dramatic change is important to explain why heated air is so much more effective than cold air in drying processes.

## Related Topics

• Air Psychrometrics - Moist and humid air - psychrometric charts, Mollier diagrams, air-condition temperatures and absolute and relative humidity and moisture content.

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Temperature

oC
oF

Length

m
km
in
ft
yards
miles
naut miles

Area

m2
km2
in2
ft2
miles2
acres

Volume

m3
liters
in3
ft3
us gal

Weight

kgf
N
lbf

Velocity

m/s
km/h
ft/min
ft/s
mph
knots

Pressure

Pa (N/m2)
bar
mm H2O
kg/cm2
psi
inches H2O

Flow

m3/s
m3/h
US gpm
cfm

3 30