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AH=RH*(( P/10130) *6.1078 *10^(7.5*t/(237.3+t))) /(( t+273.16)*461.5)
AH is absolute humidity or water vapor density (g/m3)
RH is relative humidity
p is air pressure
t is air temperature
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AH=RH*0.6108exp(17.27T/(T+237.3))

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