Question

The temperature and the dew point in an open room are $20{}^{\circ }C$ and $10{}^{\circ }C$. If the room temperature drops to $15{}^{\circ }C$, what will be the new dew point?

• A. ${10}^{\circ }C$
• B. ${11}^{\circ }C$
• C. ${15}^{\circ }C$
• D. ${20}^{\circ }C$

Answer 1

The correct option is A ${10}^{\circ }C$

Temperature = $20{}^{\circ }C$
Dew point = $10{}^{\circ }C$
The place is saturated at $10{}^{\circ }C$

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.