The Metric System
Only three nations have not officially adopted the International System of Units as their primary or sole system of measurement: Liberia, Myanmar and the United States. Stephen Colbert explains why ;)
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The metric system is a decimalised system of measurement.
One goal of the metric system is to have a single unit for any physical quantity; another important one is not needing conversion factors when making calculations with physical quantities.
All lengths and distances, for example, are measured in metres, or thousandths of a metre (millimetres), or thousands of metres (kilometres), and so on.
There are no different units with different conversion factors, such as inches, feet, yards, fathoms, rods, chains, furlongs, miles, nautical miles, leagues, etc. Multiples and submultiples are related to the fundamental unit by factors of powers of ten, so that one can convert by simply moving the decimal place: 1.234 metres is 1234 millimetres, 0.001234 kilometres, etc.
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