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Metric System Day
This holiday takes place on April 7 every year. Now often used as a synonym for the International System of Units (or SI), the metric system is a system of measurement used in most countries of the world except the USA and a few other countries.
The metric system was introduced by France in 1795 and it’s an original, decimal-based measurement format based on meters and kilograms.
Base units include kilograms, meters, and liters. The metric system also uses the Kelvin/Celsius scale to measure the temperature.