



 
Todd, I think you mean 10 millimetres of rain over 1 square metre. 10 millimetres is a centimetre and there are 100 centimetres in a metre so you have 1 cm of rain over 100 × 100 = 10000 square cms. That is a volume of 1 × 10000 = 10000 cubic centimetres. One cubic centimetre is a millilitre and hence the volume of water is 10000 milliletres. Finally there are 1000 millilitres in a litre so the volume of rain is 10000/1000 = 10 litres. Penny  


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