for air water system wet bulb equals to dry bulb at 100 %
relative humidity for that given temperature of air.
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A wet bulb measures the temperature after water evaporation
allows to cool and a dry bulb measures air temperature.
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the "current" temperature, ie, the temperature at which wet bulb
and dry bulb are the same. when the wet bulb and dry bulb
temperaturs equalized the dew point emperature equals them, because
the air is saturated now.
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it is difference between wet bulb temperature and dry bulb
temperature.