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Home > Unit of length

Common units of length in the International System of Units (SI) are:

• metre (or "meter" in US English) and its multiples, such as " centimetre" or " kilometre"

Non-SI units of length include:

• fermi (fm) (= 1 femtometre in SI units)
• angstrom (Å) (= 100 picometres in SI units)
• micron (= 1 micrometre in SI units)

Common Imperial units and U.S. customary units of length include:

• inch (25.4mm)
• foot (0.3048m)
• yard (0.9144m)
• (terrestrial) mileA mile is any of several units of distance, or, as physicists say, of length. Today, one mile is mainly equal to about 1609 metres on land and 1852 metres at sea and in the air, but see below for the details. Current definitions The meanings of mile that (~1640m)

In addition, the following are used by mariners...

• fathomThis page deals with fathom, a unit of measure. For information about the comic book title and character created by Michael Turner, see Fathom (comics). A fathom is a unit of measure equal to 2 yards or 6 feet, or 1. 8288 metres. It was originally defined (for depth) (1.8288m)
• nautical mileA nautical mile is a unit of distance, or, as physical scientists like to call it, length. It is widely used around the world for maritime and aviation purposes. The international nautical mile is defined as exactly 1,852 metres. This definition was adopt (1852m)

...and surveyors in the United StatesThe United States of America also referred to as the United States U. America ¹ or the States is a federal republic in central North America, stretching from the Atlantic in the east to the Pacific Ocean in the west. It shares land borders with Canada in continue to use...

• chainAs a unit of measurement within the Imperial system, the chain was defined as 22 yards, or 66 feet. Ten chains therefore made one furlong. In metric units, a chain equals 20. 1168 metres. The unit was little used in everyday life even in the heydey of Imp (~20.1m)
• poleA pole (more commonly called a perch or a rod is a unit of length, equal to 5. 5 yards or 16. 0292 metres in SI units). The length is equal to the standardized length of the ox-goad used by medieval English ploughmen; fields were measured in in acres whic, also called rod or perch (~5m)

...while horse racing keeps alive:

• furlong (~201m)

• astronomical unit (AU) (~149 gigametres)
• light year (ly) (~9.46 petametres)
• parsec (pc) (~30.8 petametres), including kiloparsec (kpc) and megaparsec (Mpc)

• Planck length
• Bohr radius

Archaic units of distance are described in the article on Historical weights and measures. They include:

• cana
• cubit
• league
• li ( China)
• pace (the "double pace" of about 5 feet used in Ancient Rome)
• verst ( Russia)

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Topics: Unit Of Length Units Include Common Pace Petametres Mile...

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