Kilometre

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1 kilometre =
International units
1000 m 1 km
1×106 mm 10×1012 Å
6.685×10−9 AU 105.7×10−15 ly
US customary / Imperial units
39.37×103 in 3280.84 ft
1093.613 yd 0.621 mi
“km” redirects here. For other uses, see KM.

A kilometre (American spelling: kilometer, symbol km) is a unit of length in the metric system, equal to one thousand metres, the current SI base unit of length. It can be written in scientific notations as 1×103 m (engineering notation) or 1 E+3 m (exponential notation) — both meaning 1,000 × 1 m.

nanometre <<< micrometre <<< millimetre < centimetre < decimetre < metre < decametre < hectometre < kilometre <<< megametre

A corresponding unit of area is the square kilometre and a corresponding unit of volume is the cubic kilometre.

In English, the word "kilometre" is often pronounced with the stress on the second syllable (ki-LOM-etre) - following the stress pattern that applies to measuring devices (barometer and thermometer) rather than to other multiples of the meter (millimeter, decimeter) or other SI units (kilogram).

Slang terms for kilometre include "klick" (sometimes spelled "click" or "klik") and "kay" (or "k"). These non-standard terms can also refer to kilometres per hour, which itself is abbreviated as km/h, km h-1, km·h-1 or, informally, kph.

"Kilometrage" may be used in the same way as "mileage".

Contents

[edit] Equivalence to other units of length

1 kilometre is equal to:

  • 1,000 metres (1 metre is equal to 0.001 kilometres)
  • about 0.621 statute miles (1 statute mile is equal to 1.609344 kilometres)
  • about 1,094 international yards (1 international yard is equal to 0.0009144 kilometres)
  • about 3,281 feet (1 foot is equal to 0.0003048 kilometres)

[edit] International usage

Virtually all countries of the world use the kilometre as a standard measure of distance, particularly on road network signage to indicate distances to cities, towns, villages and suburbs etc. The only states to use the mile are United States of America, the United Kingdom, Liberia, and Burma (Myanmar).

Although the UK has officially adopted the metric system, there is no intention to replace the mile on road signs in the near future, owing to the British public's attachment to traditional imperial units of distance, i.e., miles, yards and inches. It is possible that at some point in the future, the European Union's Commission may apply pressure upon the UK to conform with the other member states. Organisations such as the UK Metric Association (UKMA), which is supported by a number of politicians from all parties, have attempted to raise awareness of what it calls 'a very British mess'.

In the US, proposals to introduce metric signs on the federally owned interstate highways met with overwhelming public opposition. The National Highway System Designation Act of 1995 prohibits the use of federal-aid highway funds to convert existing signs or purchase new signs with metric units. [1] (See also Metrication in the United States.)

[edit] Unicode symbols

For the purposes of compatibility with Chinese, Japanese and Korean (CJK) characters, Unicode has symbols for:

They are useful only with East Asian fixed-width CJK fonts, because they are equal in size to one Chinese character.

[edit] See also

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