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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.
The metric system was first implemented during the French Revolution (1790s) with just the metre and kilogram as standards of length and mass respectively. In the 1830s Carl Friedrich Gauss laid the foundations for a coherent system based on length, mass, and time.