Answer :

Dew point is 20.


Explanation


Formula for relative humidity is given as



Where both actual vapor pressure and saturation vapor pressure are at same temperature.


Given


Temperature of air =20


Relative humidity=100%


So,




actual vapor pressure =saturation vapor pressure at the temperature 20


The temperature at which relative humidity is 100% i.e. air is completely saturated, is called dew point.


Here, the temperature at which the air is completely saturated is 20.


So, dew point is 20.


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