So that if you talk to someone in Another Country about a certain measure of something you are both agreed on exactly how much you mean. Unlike a gallon - which can mean different things on either side of the Atlantic.
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International System of Units (SI)
the international system of units is based on units of 10 and has 3 main standards, the meter, liter, and gram.
si units are based on the metric system system international (French) international system (English)
International System of Units
International system of units.