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Question

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

A
10 C
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B
11 C
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C
15 C
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D
20 C
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Solution

The correct option is A 10 C
Temperature = 20 C
Dew point = 10 C
The place is saturated at 10 C

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

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