Definition:Metric System/Length/Millimetre

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Millimetre

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


Symbol

$\mathrm {mm}$

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

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


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


Square Millimetre

The square millimetre is a metric unit of area.


The symbol for the square millimetre is $\mathrm {mm}^2$.


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.


Linguistic Note on Milli-

The prefix milli- derives from the Latin mille, which means one thousand.


Sources

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