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Petagram or petagramme is equal to 1015 gram (unit of mass), comes from a combination of the metric prefix peta (P) with the gram (g). Plural name is petagrams.
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").