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Why can dew point be a better indicator of mugginess than relative humidity (RH) in meteorology?

Answer and explanation

Correct answer: Because dew point is more directly linked with the actual amount of water vapour.

The correct answer is A. Dew point is the temperature to which air must be cooled, at roughly constant pressure and moisture content, for saturation to begin. A high dew point means that the air contains a relatively large amount of water vapour. Since discomfort or mugginess is strongly related to how much moisture the body must evaporate into the air, dew point often gives a useful direct indication of humid conditions. Relative humidity is a percentage comparing the air’s present vapour content with the maximum possible content at its current temperature. Because that maximum changes with temperature, RH can change even when the actual moisture amount remains similar. A is therefore the best answer. B is wrong because dew point does not show wind direction. C is wrong because RH is a ratio or percentage, not a mass measurement. D is wrong because mugginess is closely related to atmospheric moisture. A high dew point usually signals muggy air, although personal comfort also depends on temperature, wind and radiation. Memory cue: dew point tells how much moisture is present; RH tells how full the air is at its current temperature.

Related tags

Dew PointMugginessRelative HumidityHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereGeographyClass 12 Mcq

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