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The kilogram or kilogramme (SI unit symbol: kg) is the base unit of mass in the International System of Units (SI) (the Metric system) and is defined as being equal to the mass of the International Prototype of the Kilogram (IPK, also known as "Le Grand K" or "Big K").
Megagram or megagramme is equal to 1 000 000 gram (unit of mass), comes from a combination of the metric prefix mega (M) with the gram (g). Plural name is megagrams.