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17 ) Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit. [2-md4] Local/National Standards:
Length: A distance between two points. Meter: Basic unit of length in the metric system. Meter stick: A scientific instrument used to measure length and distance in the metric system. Metric system: A system of measurement used in science and in most countries of the world. Millimeter: A metric unit of measurement equaling 1/1000th of a meter. Abbreviated mm, there are 1,000 mm in 1 meter.