Flying Ace Exams
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When the temperature-dew point spread (T-Td) is 2°C or less, fog or low clouds are likely because:
A.
Water droplets fall as drizzle when the spread is small
B.
The air is near saturation — a small drop in temperature will reach the dew point and produce condensation
C.
Relative humidity is always above 100% when the spread is 2°C or less
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