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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 first English official measurement standards were defined in 15th century. British system of units, known as imperial units, was established in 1824. Later in 1963 the standards were redefined in terms of metre stantard maintained in Paris. From 1995 the UK adopted metric units for general use.