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The kilometre (SI symbol: km; / ˈ k ɪ l ə m iː t ər / or / k ɪ ˈ l ɒ m ə t ər /), spelt kilometer in American and Philippine English, is a unit of length in the International System of Units (SI), equal to one thousand metres (kilo-being the SI prefix for 1000).
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)
kilometre (km) or kilometer is a metric unit used, outside the US, to measure the length of a journey; the international statute mile (mi) is used in the US; 1 mi = 1.609344 km; nautical mile is rarely used to derive units of transportation quantity.
It was used along with the metric system for a while, but is long discontinued. A metric lieue was used in France from 1812 to 1840, with 1 metric lieue being exactly 4,000 m, or 4 km (about 2.5 mi). [ 4 ]
As in Greek, the number "ten thousand" is used figuratively in Chinese to mean any "immeasurable" value and this title has never provided a literal distance of 10,000 li (5,000 km or 3,100 mi). The actual length of the modern Great Wall is around 42,000 li (21,000 km or 13,000 mi), over 4 times the name's proverbially "immeasurable" length.
The Suez Canal is 163 km (101 mi) long. A length of 100 kilometers (about 62 miles), as a rough amount, ...
Length (m), Mass (kg), Volume (l) and Temperature (°C): The kilogram is the mass of a litre of cold water. 1 millilitre of water occupies 1 cubic centimetre, weighs 1 gram. Candela (cd) and Watt (W) relationship: Candela is about the luminous intensity of a moderately bright candle, or 1 candle power; a 60 Watt tungsten-filament incandescent ...
It is not a true mathematical unit, as all ages, epochs, periods, eras, or eons don't have the same length; instead, their length is determined by the geological and historical events that define them individually. Note: The light-year is not a unit of time, but a unit of length of about 9.5 petametres (9 454 254 955 488 km).