# Metre (unit)/Related Articles

From Citizendium, the Citizens' Compendium

*See also changes related to Metre (unit), or pages that link to Metre (unit) or to this page or whose text contains "Metre (unit)".*

## Parent topics

- Length [r]:
*Add brief definition or description* - Unit (measurement) [r]: A basic quantity, multiples or parts of which are used to express other measured quantities.
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## Subtopics

- Kilometre [r]: An SI unit of length, equal to 1000 metres, commonly used for measuring distances on the earth's surface.
^{[e]} - Decimetre [r]: An SI unit of length, equal to 10
^{-1}metres.^{[e]} - Centimetre [r]: An SI unit of length, equal 0.01 metres.
^{[e]} - Millimetre [r]: An SI unit of length, equal to 10
^{-3}metres.^{[e]} - Micrometre [r]: An SI unit of length, equal to 10
^{-6}metres.^{[e]} - Nanometre [r]: An SI unit of length, equal to 10
^{-9}metres.^{[e]} - Picometre [r]: An SI unit of length (pm), equal to 10
^{ −12}metres^{[e]} - Femtometre [r]: An SI unit of length, equal to 10
^{-15}metres.^{[e]} - Attometre [r]: A submultiple of the SI base unit of length, viz., the metre, equal to 10
^{-18}metres; 1 metre consists of 10^{18}attometres.^{[e]}

- Allometry [r]: The study of scaling effects in biology.
^{[e]} - Ångström [r]:
*Add brief definition or description* - Astronomic Unit [r]:
*Add brief definition or description* - Atomic units [r]: A system of units convenient for atomic and molecular calculations.
^{[e]} - Cubic metre [r]:
*Add brief definition or description* - Imperial System of Units [r]:
*Add brief definition or description* - International System of Units [r]: Metric unit system based on the metre, kilogram, second, ampere, kelvin, mole and candela.
^{[e]} - Isometry [r]:
*Add brief definition or description* - Metre (disambiguation) [r]:
*Add brief definition or description* - U.S. customary units [r]: The units of measurement that are currently used in the United States.
^{[e]} - Square metre [r]:
*Add brief definition or description* - Speed of light [r]: A physical constant
*c*describing the speed of electromagnetic radiation in vacuum. In the International System of Units the metre is the distance light travels in classical vacuum in 1/*c*seconds, using the defined value*c = c*≡ 299 792 458 m/s (exact)._{0}^{[e]}