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Short ton
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The short ton (S/T) is a unit of weight equal to 2,000 lb
(around 907.18474 kg). In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne, 1,000 kilograms) or the long ton (2,240 pounds, roughly 1,016 kg); rather, the other two are specifically noted. There are, however, some U.S. applications for which unspecified tons normally means long tons (for example, Navy ships)
or metric tons (world grain production figures).
Both the long and short ton are defined as 20 hundredweights, but a hundredweight is 112 pounds (which is equal to 8 stone) in the Imperial system (long or gross hundredweight) and 100 pounds in the U.S. system (short or net hundredweight).
The spelling tonne is from Gallic and French.

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Encyclopedia
The short ton (S/T) is a unit of weight equal to 2,000 lb
(around 907.18474 kg). In the United States it is often called simply ton without distinguishing it from the metric ton (or tonne, 1,000 kilograms) or the long ton (2,240 pounds, roughly 1,016 kg); rather, the other two are specifically noted. There are, however, some U.S. applications for which unspecified tons normally means long tons (for example, Navy ships)
or metric tons (world grain production figures).
Both the long and short ton are defined as 20 hundredweights, but a hundredweight is 112 pounds (which is equal to 8 stone) in the Imperial system (long or gross hundredweight) and 100 pounds in the U.S. system (short or net hundredweight).
The spelling tonne is from Gallic and French. The term applied to the barrel of the largest size. In Old English the spelling was tunne, "cask". A full cask about a metre high could easily weigh a metric tonne, since the volume of the antiquated British wine cask tun is defined as 954 litres which for water (density = 1) amounts to as many kilograms. In the context of heraldry, the term 'tun' is also recognized -- again meaning a very large barrel, such as a brewer might use. For example, tuns are part of the blazon of the brewer's guild of London, England.
A short ton–force is 2,000 pounds-force (8,896 newtons).
See also
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