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  2. Kilometre - Wikipedia

    en.wikipedia.org/wiki/Kilometre

    nautical units. 0.539 96 nmi. The kilometre (SI symbol: km; / ˈkɪləmiːtər / or / kɪˈlɒmətər /), 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). It is the preferred measurement unit to express distances ...

  3. International System of Units - Wikipedia

    en.wikipedia.org/wiki/International_System_of_Units

    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.

  4. Kos (unit) - Wikipedia

    en.wikipedia.org/wiki/Kos_(unit)

    1.9 mi. 656 ft. The kos (Hindi: कोस), also spelled coss, koss, kosh, koh (in Punjabi), krosh, and krosha, is a unit of measurement which is derived from a Sanskrit term, क्रोश krośa, which means a 'call', as the unit was supposed to represent the distance at which another human could be heard. It is an ancient Indian ...

  5. Nautical mile - Wikipedia

    en.wikipedia.org/wiki/Nautical_mile

    The equatorial circumference is slightly longer than the polar circumference – the measurement based on this (⁠ 40,075.017 km / 360 × 60 ⁠ = 1,855.3 metres) is known as the geographical mile. Using the definition ⁠ 1 / 60 ⁠ of a degree of latitude on Mars, a Martian nautical mile equals to 983

  6. Metric system - Wikipedia

    en.wikipedia.org/wiki/Metric_system

    The metric system is a decimal -based system of measurement. The current international standard for the metric system is the International System of Units (Système international d'unités or SI), in which all units can be expressed in terms of seven base units: the metre (m), kilogram (kg), second (s), ampere (A), kelvin (K), mole (mol), and ...

  7. Knot (unit) - Wikipedia

    en.wikipedia.org/wiki/Knot_(unit)

    0.514444. ft/s. 1.68781. The knot (/ nɒt /) is a unit of speed equal to one nautical mile per hour, exactly 1.852 km/h (approximately 1.151 mph or 0.514 m/s). [1][2] The ISO standard symbol for the knot is kn. [3] The same symbol is preferred by the Institute of Electrical and Electronics Engineers (IEEE), while kt is also common, especially ...

  8. Metrication in the United States - Wikipedia

    en.wikipedia.org/wiki/Metrication_in_the_United...

    Signage on this road is being converted back to customary units as it is replaced. Another exception is the turnpike section of Delaware Route 1, which uses a kilometer-based system, in anticipation of the mid-1990s conversion in the U.S. to the metric system, which did not happen. [103]

  9. History of the metric system - Wikipedia

    en.wikipedia.org/wiki/History_of_the_metric_system

    Units in everyday use by country as of 2019 The history of the metric system began during the Age of Enlightenment with measures of length and weight derived from nature, along with their decimal multiples and fractions. The system became the standard of France and Europe within half a century. Other measures with unity ratios [Note 1] were added, and the system went on to be adopted across ...