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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 length measurement was introduced to measure distance between any two objects. The base metric (SI) measurement unit of length is a meter. The meter is defined as the distance traveled by light in vacuum during 1/299 792 458 of a second.