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Dew point is the temperature at which air becomes what?

Answer and explanation

Correct answer: Saturated

Dew point is the temperature at which air becomes saturated with water vapour when it is cooled, assuming the amount of vapour remains appropriate for that condition. Saturated air is holding as much water vapour as it can at that temperature. If cooling continues below the dew point, some vapour changes into liquid water or ice on suitable surfaces, producing condensation such as dew, fog, or cloud droplets. The exact amount of moisture matters, so dew point is different from simply saying that the air is cold.

Option B is correct because saturation is the defining condition at the dew point. Option A is the opposite of the idea: the air is not necessarily dry. Dust may sometimes provide surfaces for condensation, but it is not what defines dew point. “Very hot” is also not a necessary condition, since the dew point can occur at many temperatures. Thus, the key idea is maximum moisture-holding capacity at the stated temperature.

Related tags

Dew PointSaturationCondensation

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