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The ounce (abbreviated oz; apothecary symbol: ℥) is a unit of mass used in most British derived customary systems of measurement.
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").