Question

The weather report reads, "Temperature 20^0 C : Relative humidity 100 %". What is the dew point ?

Answer 1

Given Temperature = ${20}^0$ C

Relative humidity = 100 %

So the air is saturated at ${20}^0$ C

Dew point is the temperature at which saturated vapour pressure is equal to present vapour pressure

So, ${20}^0$ C is the dew point.