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Q:

When does dew fall?

  • 1
    The moist air condenses on the cold surface
  • 2
    The air is cooler than the surface of the earth
  • 3
    The sky gets cloudy at night
  • 4
    The air is so dry that it cannot rain
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Answer : 1. "The moist air condenses on the cold surface"
Explanation :

The deposition occurs when the temperature of the surface falls below the frost point. Similarly, dew forms when the air or surface temperature falls below the dew point temperature. (Note that the water vapor goes directly from gas to ice.

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