Long ton (weight ton or imperial ton) is the name for the unit called the "ton" in the avoirdupois or Imperial system of measurements, as used in the United Kingdom and several other Commonwealth countries. It has been mostly replaced by the short ton in the United States and the tonne (metric ton) elsewhere. It is equal to 2,240 pounds (1,016.0469088 kg) or 35 cubic feet (0.99108963 m³) of salt water with a density of 1.025 g/ml.[1] It has some limited use in the United States, most commonly in measuring the displacement of ships, and was the unit prescribed for warships (e.g. battleships limited to 35,000 long tons (35,561.6 t)) in the international agreements between the world wars.

Sulphur as recovered in an oil refinery is a product that is commonly measured in long tons.

The standard ton in the U.S. measurement system is the "short ton", equal to 2,000 pounds (907.18474 kg) (exactly). Both long and short tons are defined as 20 hundredweights, but a hundredweight is 112 pounds (50.8 kg) (which is equal to 8 stone, 1 stone/6.35 kilograms) in the Imperial system (long or gross hundredweight) and 100 pounds (45.4 kg) in the U.S. system (short or net hundredweight).

The spelling "tonne" denotes the metric tonne of 1,000 kg (2,204.623 lb) (approximately).

A long ton-force is 2,240 pounds-force (9,964.0164182 N).

See alsoEdit

  • Short ton, 2,000 lb (907.18474 kg).
  • Tonnage, volume measurement used in maritime shipping. Originally based on 100 cubic feet (2.83168466 m³) .
  • Tonne, also known as a metric ton (t). 1,000 kg (2,204.623 lb).
  • Glossary Index


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