Meteorology · Humidity
The dew point is the temperature to which air must be cooled, at constant pressure, to become:
- ACompletely dry
- BWarmer than the surroundings
- CSaturated (relative humidity 100%)✓ Correct
- DFree of fog
Explanation
At the dew point the air is saturated and further cooling causes condensation (fog, dew, cloud). A small spread between air temperature and dew point indicates high humidity and fog potential.
Authority: Bowditch (Pub. No. 9), humidity
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