weather theoryFAA-published question bank (Private Pilot, 2008)
Clouds, fog, or dew will always form when
A
water vapor condenses.✓ Correct Answer
B
water vapor is present.
C
relative humidity reaches 100 percent.
Explanation
Clouds, fog and dew are visible water produced by condensation, so they always form when water vapor condenses. Water vapor is always present to some extent without forming clouds, and air can reach 100 percent relative humidity without visible condensation if condensation nuclei are lacking.
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