The short ton is a unit of mass equal to 2,000 http://en.wikipedia.org/wiki/Pound_(mass)">pounds (907.18474 http://en.wikipedia.org/wiki/Kilogram">kg).http://en.wikipedia.org/wiki/Short_ton#cite_note-NIST44-C-1"> In the http://en.wikipedia.org/wiki/United_States">United States it is often called simply tonhttp://en.wikipedia.org/wiki/Short_ton#cite_note-NIST44-C-1"> without distinguishing it from the http://en.wikipedia.org/wiki/Tonne">tonne (1,000 kilograms / 2,204.62262 pounds) or the http://en.wikipedia.org/wiki/Long_ton">long ton (2,240 pounds / 1,016.0469088 kilograms); 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)http://en.wikipedia.org/wiki/Short_ton#cite_note-BTS.GOV-2"> or metric tons (world grain production figures).
Both the long and short ton are defined as 20 http://en.wikipedia.org/wiki/Hundredweight">hundredweights, but a hundredweight is 100 pounds (45.359237 kg) in the http://en.wikipedia.org/wiki/United_States_customary_units">U.S. system (short or net hundredweight) and 112 pounds (50.80234544 kg) in the http://en.wikipedia.org/wiki/Imperial_units">Imperial system (long or gross hundredweight).http://en.wikipedia.org/wiki/Short_ton#cite_note-NIST44-C-1">
A short ton–force is 2,000 http://en.wikipedia.org/wiki/Pound-force">pounds-force (8,896.443230521 http://en.wikipedia.org/wiki/Newton_(unit)">N).
In the UK, short tons are rarely used. The word "ton" is taken to refer to a long ton, and metric tons are distinguished by the "tonne" spelling.
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