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The twenty-foot equivalent unit (abbreviated TEU or teu) is a general unit of cargo capacity, often used for container ships and container ports. [1] It is based on the volume of a 20-foot-long (6.1 m) intermodal container, a standard-sized metal box that can be easily transferred between different modes of transportation, such as ships, trains, and trucks.
Amendment 2 of 2005 further added 45 foot length containers to the standard. [7] The maximum gross mass (MGM) rating of 20- and 30-foot length units was notably increased to 30,480 kg (67,200 lb) (67,200 lbs) by Amendment 1 of 2005. [7]
Smaller units, on the other hand, are no longer standardized, leading to deviating lengths, like 8 ft (2.44 m) or 6 + 1 ⁄ 2 ft (1.98 m), with non-standard widths of 2.20 m / 86.6 in and 1.95 m / 76 + 3 ⁄ 4 in respectively, and non-standard heights of 2.26 m / 7 ft 5 in and 1.91 m / 6 ft 3.2 in respectively, [90] for storage or off-shore use.
American surveyors use a decimal-based system of measurement devised by Edmund Gunter in 1620. The base unit is Gunter's chain of 66 feet (20 m) which is subdivided into 4 rods, each of 16.5 ft or 100 links of 0.66 feet. A link is abbreviated "lk", and links "lks", in old deeds and land surveys done for the government.
It is used both as a unit of length (100 yd or 91.4 m, the length of the playing field excluding goal areas) and as a unit of area (57,600 sq ft or 5,350 m 2), about 1.32 acres (0.53 ha).
[a] This system underlies the International System of Units (SI) [b] but does not itself determine the units of measurement used for the quantities. The system is formally described in a multi-part ISO standard ISO/IEC 80000 (which also defines many other quantities used in science and technology), first completed in 2009 and subsequently ...
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 ]
The UCUM base units are the metre for measurement of length, the second for time, the gram for mass, the coulomb for charge, the kelvin for temperature, the candela for luminous intensity, and the radian for plane angle. The UCUM base units form a set of mutually independent dimensions as required by dimensional analysis.