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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 standard measurement system used by the scientists is called International System of Units, or SI. The units of measurement of a few physical quantities are considered to be base units; the units of measurement of all other quantities can be expressed through these. The base units are. Meter - a unit of length.