Definition:Metric System/Length/Millimetre

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The millimetre is a metric unit of length.

\(\ds \) \(\) \(\ds 1\) millimetre
\(\ds \) \(=\) \(\ds 1 \, 000 \, 000\) nanometres
\(\ds \) \(=\) \(\ds 1000\) micrometres
\(\ds \) \(=\) \(\ds 10^{-3}\) metres


$\mathrm {mm}$

The symbol for the millimetre is $\mathrm {mm}$:

$\mathrm m$ for milli
$\mathrm m$ for metre.

Its $\LaTeX$ code is \mathrm {mm} .

Linguistic Note

The spelling millimetre is the one adopted by the International Bureau of Weights and Measures. Millimeter is the variant used in standard American English.

See the linguistic note on metre.