|Unit system||Imperial units, U.S. customary units|
|In base units||2,240 lb|
|1 in ...||... is equal to ...|
|SI base units||1,016.047 kg|
|Metric tons||1.016047 t|
|Short tons||1.12 short tons (exactly)|
The long ton, also known as the imperial ton or displacement ton, is the name for the unit called the "ton" in the avoirdupois system of weights or Imperial system of measurements. It was standardised in the 13th century. It is used in the United Kingdom and several other Commonwealth of Nations countries alongside the mass-based metric tonne defined in 1799, as well as in the United States for bulk commodities.
It is not to be confused with the short ton, a unit of weight equal to 2,000 pounds (907.18474 kg) used in the United States, and in Canada before metrication, also referred to simply as a "ton".
A long ton is defined as exactly 2,240 pounds. The long ton arises from the traditional British measurement system: A long ton is 20 long hundredweight (cwt), each of which is 8 stone (1 stone = 14 pounds). Thus a long ton is 20 × 8 × 14 lb = 2,240 lb.
A long ton, also called the weight ton (W/T), imperial ton, or displacement ton, is equal to:
To comply with the practices of the European Union, the British Imperial ton was explicitly excluded from use for trade by the United Kingdom's Weights and Measures Act of 1985. The measure used since then is metric ton, identified through the word "tonne".
If still used for measurement then the word "ton", is taken to refer to an imperial or long ton.
In the United States, the long ton is commonly used in measuring the displacement of ships, the volume-to-carrying-weight of fuels, and in trade of baled commodities and bulk goods like iron ore and elemental sulfur. The long ton was the unit prescribed for warships by the Washington Naval Treaty of 1922 — for example battleships were limited to a displacement of 35,000 long tons (36,000 t; 39,000 short tons).
The long ton is traditionally used as the unit of weight in international contracts for many bulk goods and commodities.
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