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What daily cycle of relative humidity is generally seen with daily temperature change?

Answer and explanation

Correct answer: सुबह अधिक और दोपहर में कम

Correct answer: A. Relative humidity depends on the amount of water vapour present and on how much vapour the air can hold at its current temperature. During a typical day, temperature is lower in the early morning and higher in the afternoon. If the actual amount of water vapour changes little over that short period, the cooler morning air has a smaller moisture-holding capacity, so its relative humidity is higher. As the air warms during the day, its capacity increases, and the same amount of vapour represents a smaller percentage; relative humidity therefore tends to decrease, often reaching a lower value in the afternoon. Option A states this general pattern. Option B is wrong because afternoon relative humidity is not always 100 percent; saturation occurs only under particular conditions. Option C is wrong because ordinary air contains some moisture and relative humidity is not always zero. Option D is wrong because temperature strongly affects moisture-holding capacity and therefore relative humidity. The exact daily pattern can be modified by clouds, rain, wind, and changes in moisture, but the usual temperature-linked pattern is morning high and afternoon low. Memory cue: cooler air is closer to saturation; warmer air can hold more vapour.

Related tags

GeographyDaily CycleRelative HumidityTemperatureHumidityEvaporationAnd CondensationHumidity Evaporation And CondensationWater In The AtmosphereClass 12 Mcq

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