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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).
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 ...
While metric use is mandatory in some countries and voluntary in others, all countries have recognised and adopted the SI, albeit to different degrees, including the United States. As of 2011, ninety-five percent of the world's population live in countries where the metric system is the only legal system of measurement. [3]: p. 49, ch 2
The World Book Encyclopedia is an American encyclopedia. [1] World Book was first published in 1917. Since 1925, a new edition of the encyclopedia has been published annually. [1] Although published online in digital form for a number of years, World Book is currently the only American encyclopedia which also still provides a print edition. [2]
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The letter K is commonly used as a capital letter and as a suffix to denote a thousand of a unit (e.g., "She earns $80K"), [46] [47] even though this is inconsistent with "k" in SI, where the letter k is used only as a lowercase letter and as a prefix to denote "thousand" (e.g., "She travelled 80 km"). [48]
The World Almanac and Book of Facts, 1987, besides a tea kettle, TIPA, Dharamsala, India. In 1894, when it claimed more than a half-million "habitual users," The World Almanac changed its name to The World Almanac and Encyclopedia. This was the title it kept until 1923, when it became The World Almanac and Book of Facts, the name it bears today.
SI, and hence the use of "km/h" (or "km h −1 " or "km·h −1 ") has now been adopted around the world in many areas related to health and safety [36] and in metrology [37] in addition to the SI unit metres per second ("m/s", "m s −1 " or "m·s −1 "). SI is also the preferred system of measure in academia and in education.