0.001 metres.
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1mm is 0.001 m
1mm = 1 millimetre = 1/1,000 metre = 1/10 centimetre so first m = milli second m = metre
0.001 m = 1mm.
1 mm = 1/1000 of a metre The milli- prefix means 1/1000 → 1 mm = 1/1000 m → 1 m = 1000 × 1/1000 m = 1000 mm → 1mm/1m = (1 mm)/(1000 mm) = 1/1000
1 metre.