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The usual metric base unit to measure distance is the metre (m). This may be prefixed by a multiplier (eg k - kilo = x 1000, c - centi = x 0.01, m - milli = x 0.001, etc) to allow for a more compact display of different measurements.

In imperial system, there is no real base unit, but different units which represent multiples of an inch are used dependant upon what kind of distance is being measured (eg distance between spark plug contacts or distance from London to York), the most common ones being: thou = 0.001 inch, foot = 12 inches, yard = 36 inches, fathom = 72 inches, chain = 792 inches, furlong = 7920 inches, mile = 63360 inches.

Astronomically, the distances are so large, that the base unit is the light-year which is the distance light travels in 1 year.

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Q: What unit of measurement is most used to measure distance?
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