Metric System Day takes place on April 7 every year. Now often used as a synonym for the International System of Units (or S.I.), the metric system is a system of measurement used in most countries of the world except the United States and a few other countries. The metric system was introduced by France in 1799 and it’s an original, decimal-based (based on powers of 10) measurement format based on meters and kilograms. Base units in the metric system include kilograms, meters, and liters. The metric system also uses the Kelvin scale (or the Celsius scale) to measure the temperature. The decimal-based prefixes in the metric system include milli, centi, deci, and kilo. However, these prefixes are not used with the temperature degree.
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