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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 international system of units (SI) is an international decimal system of weights and measures derived from the metric system of measurement. Developed by international agreement, it is the most widely used system of measurement, especially for scientific work.