Millimetres
Millimetre, abbreviated mm, is a unit of length in the metric system. It is defined as one thousandth of a metre, so 1 mm = 0.001 m. The millimetre is a common unit for measuring small distances in science, engineering and everyday life, where centimetres or metres may be too coarse.
The term millimetre derives from milli- meaning thousandth and metre. It is part of the International System
One metre equals 1000 millimetres, and one centimetre equals 10 millimetres. A micrometre equals 0.001 millimetres,
Practical usage: tools with metric scales, such as rulers, calipers and micrometres, typically mark lengths in
Everyday examples: the thickness of a credit card is about 0.76 mm; a human hair commonly ranges