Part 1. Which of the following indicates a decrease in the actual amount of wate

Question

Part 1. Which of the following indicates a decrease in the actual amount of water vapor in the atmosphere?

            A. A decrease in mixing ratio

            B. A decrease in saturation mixing ratio

            C. A decrease in relative humidity

            D. A decrease in temperature

Part 2: At 45ºF, the atmosphere is saturated with water vapor. If the air temperature increases to 60ºF with no addition or removal of water vapor, one may conclude that the dew point is about:

A. 15ºF.

B. 45ºF.

C. 60ºF.

D. 105ºF.

Explanation / Answer

Part 1. Actual amount of water vapours in atmosphere decreases with decreasing temperature therefore option D is correct.

Part 2. Dew point : The dew point is the temperature to which air must be cooled to become saturated with water vapor. When further cooled, the airborne water vapor will condense to form liquid water (dew). When air cools to its dew point through contact with a surface that is colder than the air, water will condense on the surface. When the temperature is below the freezing point of water, the dew point is called the frost point, as frost is formed rather than dew.The measurement of the dew point is related to humidity. A higher dew point means there will be more moisture in the air.

Because water vapors increases with increasing temperatue in atmosphere that means warm air has more amount of water than cooled air. Thus when the temperatur is increases then dew point will also increases that means option C is correct.

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