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Humidity

Absolute Humidity (as g/m3)

D =     804    
1 + 0.00633t
x   e  
 Po
  =   H  
 100
x     804    
1 + 0.00633t
x   e  
 Po

 

Dew Point Temperature (as °C)

T =   237.3/7.5  
log e - 0.786
- 1
e =   H  
 100
x es
es = 6.1078 x 107.5t(237.3 + 1)

 

Relative Humidity (as % RH)
RH =   e  
 es
x 100 =   D  
 Ds
x 100
H = relative humidity (% RH)
Po = standard air pressure (mm Hg)
D = absolute humidity (g/m3)
e = water steam pressure (mm Hg)
Ds = absolute humidity in saturation (g/m3)
es = saturated water steam pressure (mm Hg)
t = temperature (°C)
T = dew point temperature

 

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