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Why is dew point temperature considered a more reliable indicator of moisture content?

Answer and explanation

Correct answer: Because it is directly linked with the actual amount of water vapour present

The correct answer is A. Dew point is the temperature to which air must be cooled for it to become saturated, assuming its water-vapour content remains essentially unchanged. Air with more water vapour has a higher dew point because it needs less cooling to reach saturation. Air with little water vapour has a lower dew point and must cool much more before condensation begins. Unlike relative humidity, dew point is less misleading when temperature changes: relative humidity can fall simply because air warms, even if no moisture is added or removed. B, C, and D describe unrelated quantities. Dew point does not measure wind direction, rainfall sound, or ocean salinity. It is not a direct measurement of every atmospheric condition, and it does not guarantee rain, but it is a useful indicator of the moisture actually present. Memory cue: high dew point means moist air; low dew point means dry air.

Related tags

GeographyDew PointMoistureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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