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Metric System: The metric system is an internationally agreed decimal system of measurement created in France in 1799. The International System of Units (SI), the official system of measurement in almost every country in the world, is based upon the metric system.
In 1948, an overhaul of the metric system was set in motion which resulted in the development of the Practical system of units which, on its publication in 1960, was given the name The International System of Units.