Metre

== SI prefixed forms of metre ==
{{Main|Orders of magnitude (length)}}
[[SI prefix]]es can be used to denote decimal multiples and submultiples of the metre, as shown in the table below. Long distances are usually expressed in km, [[astronomical unit]]s (149.6&nbsp;Gm), [[light-year]]s (10&nbsp;Pm), or [[parsec]]s (31&nbsp;Pm), rather than in Mm, Gm, Tm, Pm, Em, Zm or Ym; "30&nbsp;cm", "30&nbsp;m", and "300&nbsp;m" are more common than "3&nbsp;dm", "3&nbsp;dam", and "3&nbsp;hm", respectively.

The terms ''[[micron]]'' and ''[[millimicron]]'' have been used instead of ''micrometre'' (μm) and ''nanometre'' (nm), respectively, but this practice is discouraged.<ref>[[#taylor2008b|Taylor & Thompson 2003, p. 11.]]</ref>

{{SI multiples
| unit=metre
| symbol=m
| xd=[[decimetre]]
| xda=[[decametre]]
| xc=[[centimetre]]
| xh=[[hectometre]]
| xm=[[millimetre]]
| xk=[[kilometre]]
| xmc=[[micrometre]]
| xn=[[nanometre]]
| xp=[[picometre]]
| xf=[[femtometre]]
}}