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Metric System
The system of measurements used in most countries in which the meter is the unit of length, the kilogram is the unit of mass, and the second is the unit of time.
English System
The system of units used in the US and various other countries in which the inch is the unit of length, the pound is the unit of force, and the ounce is the unit of mass.
International System of Units (SI)
The standard unit system used by scientists
Meter (m)
The SI standard unit of length; equivalent to 39.37 inches.