## Encyclopedia > Kilometre

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# Kilometre

A kilometre (or kilometer) (or km) is a unit of length equal to 1000 metres.

See 1 E3 m to compare the length of a kilometre.

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 Statistical mechanics ... = \sum_i \exp\left(\frac{-E_i}{kT}\right)[/itex] where $k$ is Boltzmann's constant, $T$ is the temperature ...