Math CentralQuandaries & Queries


Question from Joyce:

Please help me with this question.
How many tonnes of water fell on 1 hectare of land during a rainfall of 5mm?

Hi Joyce,

One hectare is 10,000 square meters and 1 millimeter is $\large \frac{1}{1000}$ meters so 5 mm of rain on one hectare produces a volume of

\[10,000 \times \frac{5}{1000} = 50 \mbox{ cubic meters.}\]

How much does 1 cubic meter of water weigh? Ask Google.


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