The Strait of Gibraltar is 13 kilometres narrow

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To help compare different orders of magnitude this page lists lengths between 10 and 100 kilometres (10⁴ to 10⁵ metres).

Distances shorter than 10 kilometres

[edit] Conversions

10 kilometres is equal to:

• 10,000 metres
• 6.2 miles
• 1 mil, unit of measure commonly used in Norway^{[citation needed]} and Sweden^[1]
• 1 peninkulma, unit of measure commonly used in Finland; earlier peninkulma was 10.688 km^{[citation needed]}
• 1 farsang, unit of measure commonly used in Iran and Turkey^{[citation needed]}

[edit] Sports

• 42.195 km^{[note 1]} — length of the Marathon,^[2] the longest mainstream long-distance road running event^{[needs citation]}

[edit] Human-defined scales and structures

• 18 km — cruising altitude of Concorde
• 27 km — circumference of the Large Hadron Collider, as of 2009^[update] the largest and highest energy particle accelerator
• 30 km — length of the longest man made dike enclosed by water on two sides, the Afsluitdijk^{[citation needed]}
• 31.3 km — highest parachute jump (Joseph Kittinger)^{[citation needed]}
• 34.668 km — highest manned balloon flight (Malcolm D. Ross and Victor E. Prather on May 4, 1961) ^[3]
• 38 km — Length of the world's longest bridge, the Second Lake Pontchartrain Causeway in Louisiana, USA
• 38.422 km — length of the Lake Pontchartrain Causeway, as of June 2006, the longest bridge in the world^{[needs citation and date(s) when true]}
• 39 km — undersea portion of the Channel tunnel
• 53.9 km — length of the Seikan Tunnel, as of February 2006^[update], the longest in the world^{[needs citation]}
• 77.1 km — total length of the Panama Canal^{[citation needed]}

[edit] Natural lengths on Earth

• 10 km — Height of Mauna Kea in Hawaii, measured from its base on the ocean floor
• 11 km — deepest known point of the ocean, Challenger Deep in the Mariana Trench
• 11 km — average height of the troposphere
• 21 km — length of Manhattan
• 23 km — depth of the largest earthquake ever recorded in the United Kingdom, in 1931 at the Dogger Bank of the North Sea
• 34 km — narrowest width of the English Channel at the Strait of Dover
• 50 km — approximate height of the stratosphere

[edit] Astronomical

• 10 km — diameter of the most massive neutron stars (3 – 5 solar masses)
• 13 km — mean diameter of Deimos, the smaller moon of Mars
• 20 km — diameter of the least massive neutron stars (1.44 solar masses)
• 20 km — diameter of Leda, one of Jupiter's moons
• 20 km — diameter of Pan, one of Saturn's moons
• 22 km — diameter of Phobos, the larger moon of Mars
• 27 km — height of Olympus Mons above the Mars reference level,^[4][5] the highest known mountain of the solar system
• 43 km — diameter difference of Earth's equatorial bulge
• 66 km — diameter of Naiad, the innermost of Neptune's moons

Distances longer than 100 kilometres

[edit] See also

Click on the thumbnail image to jump to the desired Human-scale order of length magnitude article: top-left is 1E-6m, lower-right is 1E5m.

[edit] Notes

[edit] References