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Measurement unit conversion: millimetre
Full name: millimetre
Plural form: millimeters
Symbol: mm
Alternate spelling: millimetres
Category type: length
Scale factor: 0.001
The SI base unit for length is the metre.
1 metre is equal to 1000 millimetre.
Valid units must be of the length type.
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A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length. The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre.
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