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Do you mean, How big is a millimetre? The answer to that, is :- A millimetre is one thousandth (1/1000) of a Metre. These are the names of the most commonly used units of length in the Metric system of measurement, which is today used by the whole world except for USA, Iberia, and Burma. (I am not absolutely sure about the latter 2 nations) Compared to the British Inch, there are 25.4 millimetre equal to 1Inch. The abbreviation for millimetre is :- mm

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9y ago

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