Question

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

Answer 1

Here,
Relative humidity = 100%
$\begin{array}{l}RH=\frac{\text{Vapour pressure of air}}{\text{SVP at the same temperature}}=1\\ \\ \Rightarrow \text{Vapour pressure of air}=\text{SVP at the same temperature}\\ {\text{So, the air is saturated at 20}}^0\mathrm{C}{\text{. So, dew point is 20}}^0\text{C.}\end{array}$