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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.
A board foot is a United States and Canadian unit of approximate volume, used for lumber. It is equivalent to 1 inch × 1 foot × 1 foot (144 cu in or 2,360 cm 3). It is also found in the unit of density pounds per board foot. In Australia and New Zealand the terms super foot or superficial foot were formerly used for this unit. The exact ...
Exceptions are made if the unit is commonly known by another name ... atomic unit of length: a 0 ... ≡ 40 cu ft = 1.132 673 863 68 m 3: ton (water) ...
Load bearing of container stacking is at the 40-foot coupling. Forty-foot containers are the standard unit length and load bearing points are at the ends of such containers. Longer containers, such as 45, 48 and 53 feet long, still have the load bearing points 40 feet apart, with the excess protruding equally outside this length.
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.
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 ...
Before the establishment of the decimal metric system in France during the French Revolution in the late 18th century, [4] many units of length were based on parts of the human body. [5] [6] The Nippur cubit was one of the oldest known units of length. The oldest known metal standard for length corresponds to this Sumerian unit and dates from ...
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).