Question

3. What do you mean by 1mm rain ? sub geography
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Answer 1

Answer:

1mm rainfall means every one square meter area is filled with the water of height 1mm.

1 square meter = 1000mm length ×1000mm breath

So 1mm rain means 1000mm length × 1000mm breath × 1mm height = 1litre of water.

Every square meter has one litre of water

In laymen language:

Take a vessel of 1 square meter in dimention and keep it in an open space during rain, you will be having 1mm height of water in it that is 1 litre of water in it at the end of the rain.

You can also check by rain gauge (also known as an udometer, pluviometer, or an ombrometer) it will show 1mm means 1mm rain in 24 hours.

hope it helps.