A millimetre (symbol mm) is an SI unit of length that is equal to one thousandth of a metre.
1 mm ie equal to:
See 1 E-3 m for comparisons.
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... there are 1,546 people, 509 households, and 417 families residing in the town. The population density is 129.8/km² (336.2/mi²). There are 519 housing units ...