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Why is millimetre used in measuring rainfall?

Answer and explanation

Correct answer: It indicates the depth of collected water at a place

The correct answer is A. Rainfall is commonly expressed as the depth of water that would collect on a level surface if there were no runoff, seepage, or evaporation during measurement. A rain gauge collects precipitation and records this depth in millimetres. For example, 10 mm of rainfall means that the collected water would have a depth of 10 millimetres over the gauge area. This unit makes rainfall amounts easy to compare between places and times. B is unrelated because millimetres do not measure cloud age. C and D are meaningless properties for rainfall measurement. Therefore A correctly describes the physical meaning of the unit. Memory cue: rainfall in millimetres means water depth, not total volume.

Related tags

Rainfall-MeasurementRain-GaugeMillimetreWater-DepthClouds And PrecipitationWater In The AtmosphereGeographyClass 12 Mcq

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