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1 km 2 means one square kilometre, or the area of a square of 1000 m by 1000 m. In other words, an area of 1 000 000 square metres and not 1000 square metres. 2 Mm 3 means two cubic megametres, or the volume of two cubes of 1 000 000 m by 1 000 000 m by 1 000 000 m, i.e. 2 × 10 18 m 3, and not 2 000 000 cubic metres (2 × 10 6 m 3).
Average thickness of Milky Way Galaxy [43] (1,000 to 3,000 ly by 21 cm observations [44]) 10 20: 100 Em: 113.5 Em Thickness of Milky Way Galaxy's gaseous disk [45] 10 21: 1 zettameter (Zm) 1.54 Zm Distance to SN 1987A, the most recent naked eye supernova 1.62 Zm Distance to the Large Magellanic Cloud (a dwarf galaxy orbiting the Milky Way) 1.66 Zm
The informal term "metric mile" is used in some countries, in sports such as track and field athletics and speed skating, to denote a distance of 1,500 metres (0.932 miles). The 1500 meters is the premier middle distance running event in Olympic sports. In United States high-school competition, the term is sometimes used for a race of 1,600 ...
For example, driving distances are normally given in kilometres (symbol km) rather than in metres. Here the metric prefix 'kilo-' (symbol 'k') stands for a factor of 1000; thus, 1 km = 1000 m. The SI provides twenty-four metric prefixes that signify decimal powers ranging from 10 −30 to 10 30, the most recent being adopted in 2022.
The basic unit of length in the imperial and U.S. customary systems is the yard, defined as exactly 0.9144 m by international treaty in 1959. [2] [5] Common imperial units and U.S. customary units of length include: [6] thou or mil (1 ⁄ 1000 of an inch) inch (25.4 mm) foot (12 inches, 0.3048 m) yard (3 feet, 0.9144 m)
Metric mile, an informal term for 1500 or 1600 m; Nautical mile (M, NM, nmi) Scandinavian mile (mil) Scots mile; US survey mile; Historical foreign units translated as "mile": Arabic mile (الميل, al-mīl) Austrian mile (Meile) Chinese mile (里, li) Croatian mile (milja) Danish mile (mil) German mile (Meile) Greek & Byzantine mile ...
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The barn (b) is a unit of area used in nuclear physics equal to one hundred femtometres squared (100 fm 2 = 10 −28 m 2). The are (a) is a unit of area equal to 100 m 2. The decare (daa) is a unit of area equal to 1000 m 2. The hectare (ha) is a unit of area equal to 10 000 m 2 (0.01 km 2).