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A decametre (International spelling as used by the International Bureau of Weights and Measures and by most English speaking countries, [1] [2] United States spelling dekameter or decameter [3] [4]), symbol dam ("da" for the SI prefix deca-, [1] "m" for the SI unit metre), is a unit of length in the International System of Units (SI) equal to ten metres.
To help compare different orders of magnitude, this section lists lengths between 1 kilometer and 10 kilometers (10 3 and 10 4 meters). Conversions 1 kilometer (unit symbol km) is equal to:
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 ).
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.
Length; system unit code (other) symbol or abbrev. notes conversion factor/m combinations SI: gigametre: Gm Gm US spelling: gigameter 1.0 Gm (620,000 mi) megametre: Mm Mm US spelling: megameter
This differs from many older systems in which the ratio of different units varied. For example, 12 inches is one foot , but the larger unit in the same system, the mile is not a power of 12 feet. It is 5,280 feet – which is hard to remember for many.
Earth radius R 🜨 ≈ 6,371 km [14] Lunar distance LD ≈ 384 402 km. [15] Average distance between the center of Earth and the center of the Moon. astronomical unit au. Defined as 149 597 870 700 m. [16] Approximately the distance between the Earth and Sun. light-year ly ≈ 9 460 730 472 580.8 km.
The myriametre (mym) is a unit of distance equal to ten kilometres (10 km). The hebdometre is a unit of distance equal to ten megametres (10 Mm). The spat (S) is a unit of distance equal to one terametre (1 Tm).