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To obtain a standard of length a quadrant of the earth (one-fourth of a circumference) was surveyed from Dunquerque in France to Barcelona in Spain along the meridian that passes through Paris. The distance from the North Pole to the equator was divided into ten million parts to constitute the meter (spelled metre in the International System). The definition of the meter has become more and more precise through the years since, even though its length has not changed. Currently the meter is the distance light travels in a vacuum in 1/299 792 458 second. Other (sub)multiples units of measurement in the metric system are obtained by multiplying and dividing by powers of 10.

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8y ago

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