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Question

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

A
Less than 20 C
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B
20 C
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C
More than 20 C
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D
Can’t be said.
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Solution

The correct option is B 20 C
Temperature = 20 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 C, does not change on temperature.

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