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The metric system has just one unit for mass: the gram (g). Kilo- is a prefix that means 1000, so a kilogram (kg) is 1000 grams. This way you can go to extremely large and small masses without using any other units. All you need is some prefixes.

A meter (m) is a unit of length, not mass.

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Q: Why does kg g and m need 3 units in mass?
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