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The foot (standard symbol: ft) [1] [2] is a unit of length in the British imperial and United States customary systems of measurement. The prime symbol, ′, is commonly used to represent the foot. [3] In both customary and imperial units, one foot comprises 12 inches, and one yard comprises three feet.
Among the important units of distance and length at the time were the foot, yard, rod (or pole), furlong, and the mile. The rod was defined as 5 + 1 ⁄ 2 yards or 16 + 1 ⁄ 2 feet, and the mile was eight furlongs, so the definition of the furlong became 40 rods and that of the mile became 5,280 feet (eight furlongs/mile times 40 rods/furlong ...
A number of different units (some only of historical interest) are shown and expressed in terms of the corresponding SI unit. Conversions between units in the metric system are defined by their prefixes (for example, 1 kilogram = 1000 grams, 1 milligram = 0.001 grams) and are thus not listed in this article.
The rod is useful as a unit of length because integer multiples of it can form one acre of square measure (area). The 'perfect acre' [2] is a rectangular area of 43,560 square feet, bounded by sides 660 feet (a furlong) long and 66 feet (a chain) wide (220 yards by 22 yards) or, equivalently, 40 rods by 4 rods. An acre is therefore 160 square ...
A unit of length refers to any arbitrarily chosen and accepted reference standard for measurement of length. The most common units in modern use are the metric units, used in every country globally. In the United States the U.S. customary units are also in use. British Imperial units are still used for some purposes in the United Kingdom and ...
Similarly, extra long 45 ft (13.72 m) containers are commonly counted as just two TEU, no different from standard 40 feet (12.19 m) long units. Two TEU are equivalent to one forty-foot equivalent unit (FEU). [55] [56] In 2014 the global container fleet grew to a volume of 36.6 million TEU, based on Drewry Shipping Consultants' Container Census.
Historic standard units of the city of Regensburg: from left to right, a fathom (Klafter), foot (Schuch) and ell (Öln). Prussian ell. An ell (from Proto-Germanic *alinÅ, cognate with Latin ulna) [1] is a northwestern European unit of measurement, originally understood as a cubit (the combined length of the forearm and extended hand).
Miners also use it as a unit of area equal to 6 feet square (3.34 m 2) in the plane of a vein. [2] In Britain, it can mean the quantity of wood in a pile of any length measuring 6 feet (1.8 m) square in cross section. [2] In Central Europe, the klafter was the corresponding unit of comparable length, as was the toise in France.