Weather theoryQuestion 331 of 934

What is the dew point?

  1. The temperature at which water vapor turns to ice crystals
  2. The lowest air temperature reached in the past 24 hours
  3. The temperature at which air can hold no more moisture
  4. The temperature of the air at the top of the cloud layer
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Correct answer: The temperature at which air can hold no more moisture

When air cools to the dew point it is saturated. Moisture then condenses out.

Source: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25C), Chapter 12: Weather Theory — Moisture and Temperature, page 297

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Questions last reviewed: 18 October 2026