Relative Humidity, Dew Point Formula - Weather

Formula:

es=6.112×exp(17.67×T/T+243.5)
ew=6.112×exp(17.67×Tw/Tw+243.5)
e=ew-psta × (T-Tw)× 0.00066 × (1+0.00115×Tw)

psta(in of Hg to mb)=psta×33.8639
psta(in of Hg to mb)=psta×1.333224
Tdc=(Td-32)×(5/9)
Tdk=(Td+459.67)×5/9


Where,

T = Air temperature
Tw = Wet-bulb temperature
psta = Station pressure
ew = Vapor pressure related to wet-bulb temperature
es = Saturated Vapor pressure
e = actual vapor pressure
rh = Relative humidity
Td = Dewpoint temperature in Fahrenheit
Tdc = Dewpoint temperature in celsius
Tdk = Dewpoint temperature in kelvin

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