how does the metric system work?
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The basic ideas is to have 7 base unit and lots of derived units. Standard prefixes for powers of 10. This means that you can easily combine quantities by simple multiplication/division without conversion constants.
My favourite: A4 is 1/16th of a square metre. So an A4 sheet of 80g/m^2 paper weighs exactly 5 grams. Useful when figuring out postage.
Also: 10 mm of rain means 10L/m^2 . And 1 inch of rain is 5.61 gallons per square yard. Those conversions are all simple in metric.
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