Definition:Metric System/Length

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Definition

Various metric units of length which have specific names are as follows:

Micrometre

The micrometre is a metric unit of length.

\(\displaystyle \) \(\) \(\displaystyle 1\) micrometre
\(\displaystyle \) \(=\) \(\displaystyle 10^{-3}\) millimetre
\(\displaystyle \) \(=\) \(\displaystyle 10^{-6}\) metres


Millimetre

The millimetre is a metric unit of length.

\(\displaystyle \) \(\) \(\displaystyle 1\) millimetre
\(\displaystyle \) \(=\) \(\displaystyle 1000\) micrometres
\(\displaystyle \) \(=\) \(\displaystyle 10^{-3}\) metres


Centimetre

The centimetre is the CGS base unit of length.

\(\displaystyle \) \(\) \(\displaystyle 1\) centimetre
\(\displaystyle \) \(=\) \(\displaystyle 10\) millimetres
\(\displaystyle \) \(=\) \(\displaystyle 10 \, 000\) microns
\(\displaystyle \) \(=\) \(\displaystyle 0 \cdotp 01\) metres


Metre

The metre is the SI base unit of length.

It is defined as the distance travelled by light in vacuum in $\dfrac 1 {299 \ 792 \ 458}$ of a second.

\(\displaystyle \) \(\) \(\displaystyle 1\) metre
\(\displaystyle \) \(=\) \(\displaystyle 100\) centimetres
\(\displaystyle \) \(=\) \(\displaystyle 1000\) millimetres
\(\displaystyle \) \(=\) \(\displaystyle 10 \, 000\) microns


Kilometre

The kilometre is a metric unit of length.

\(\displaystyle \) \(\) \(\displaystyle 1\) kilometre
\(\displaystyle \) \(=\) \(\displaystyle 1000\) metres
\(\displaystyle \) \(=\) \(\displaystyle 100 \, 000\) centimetres
\(\displaystyle \) \(=\) \(\displaystyle 10^6\) millimetres