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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.
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: 1.0 Mm (620 mi) kilometre: km km US spelling: kilometer: 1.0 km (0.62 mi) km mi; hectometre: hm hm US spelling: hectometer: 1.0 hm (330 ft) decametre ...
Astronomical measure uses: 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.
109 km – length of High Speed 1 between London and the Channel Tunnel [159] 130 km – range of a Scud-A missile; 163 km – length of the Suez Canal; 164 km – length of the Danyang–Kunshan Grand Bridge; 213 km – length of Paris Métro; 217 km – length of the Grand Union Canal; 223 km – length of the Madrid Metro
Geographical distance or geodetic distance is the distance measured along the surface of the Earth, or the shortest arch length. The formulae in this article calculate distances between points which are defined by geographical coordinates in terms of latitude and longitude. This distance is an element in solving the second (inverse) geodetic ...
Length measurement, distance measurement, or range measurement (ranging) all refer to the many ways in which length, distance, or range can be measured. The most commonly used approaches are the rulers, followed by transit-time methods and the interferometer methods based upon the speed of light .
A number of different units of measurement were used in Sri Lanka to measure quantities like length, mass and capacity from very ancient times. [1] Under the British Empire, imperial units became the official units of measurement [2] and remained so until Sri Lanka adopted the metric system in the 1970s.
Unit of measure cubic metre litre Reference size Usage 1 cubic metre = 1 = 1000: base unit in SI 1 barrel = 0.158 987 294 928 = 158.987294928 = 42 US gallons = 9,702 cubic inches: e. g. for oil: 1 cubic foot = 0.028 316 846 592 = 28.316864592 = 1,728 cubic inches: 1 cubic decimetre = 0.001 = 1: 1 litre = 0.001 = 1: 1 gallon (US) = 0.003 785 411 ...