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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).
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 unit of length was 10 7 m (the hebdometre, nominally the Earth quadrant), the unit of mass was an unnamed unit equal to 10 −11 g and the unit of time was the second. The units of mass and length were scaled incongruously to yield more consistent and usable electric units in terms of mechanical measures.
He proposed calling his base unit of length a "foot" which he suggested should be either 3 ⁄ 10 or 1 ⁄ 3 of the length of a pendulum that had a period of one second—that is 3 ⁄ 10 or 1 ⁄ 3 of the "standard" proposed by John Wilkins over a century previously. This would have equated to 11.755 English inches (29.8 cm) or 13.06 English ...
A derived unit is used for expressing any other quantity, and is a product of powers of base units. For example, in the modern metric system, length has the unit metre and time has the unit second, and speed has the derived unit metre per second. [5]: 15 Density, or mass per unit volume, has the unit kilogram per cubic metre. [5]: 434
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A gram of TNT as a unit of energy has been defined as 1000 thermochemical calories (1,000 cal or 4,184 J). The atom bomb dropped on Hiroshima. Its energy yield is often used in the public media and popular books as a unit of energy. (Its yield was roughly 13 kilotons, or 60 TJ.) One stick of dynamite.
A hot, strong summer wind is the overriding soundtrack to “Three Kilometers to the End of the World” — the kind of dry, whirring weather that swallows conversations held even a short ...