The weather report reads, “Temperature 20°C: Relative humidity 100%”. What is the dew point?
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.