Question

The weather report reads,
“Temperature: $20{}^{\circ }C$,
Relative humidity: $100\%$”.
What is the dew point?

• A. Less than $20{}^{\circ }C$
• B. $20{}^{\circ }C$
• C. More than $20{}^{\circ }C$
• D. Can’t be said.

Answer 1

The correct option is B $20{}^{\circ }C$

Temperature = $20{}^{\circ }C$
Relative humidity = $100\%$

Even if the temperature drops, the dew point remains unaffected. The air has vapour pressure which is the saturation vapour pressure at $10{}^{\circ }C$, does not change on temperature.