(US millimeter , abbreviation mm)
One thousandth of a metre (0.039 in.).
- With these branching patterns, roots can be characterized by fractal analysis over a range of scales from about a quarter of a millimetre to several centimetres.
- The small-scale karren features, usually a few millimetres to a few metres in size, are the most widespread karstic landform.
- The mean rainfall for September, across much of the country, ranges between a millimetre and some four millimetres.
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