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Long ton

physical science Maturity 11-13 Next article →

A long ton is a way to measure weight. It is also called an imperial ton or a British ton. Some people call it a displacement ton too. This unit belongs to the imperial system of measurements. It was made standard in the 13th century. This way of weighing things helps people trade goods.

There is a specific way this weight works. It is built from smaller units of weight. First, one stone is equal to 14 pounds. Next, one long hundredweight is equal to 8 stone. Finally, one long ton is exactly 20 long hundredweight. When you do the math, it equals 2,240 pounds. This is also 1,016.0 kilograms.

History shows us how these weights were used. The Washington Naval Treaty of 1922 used this unit. This treaty set rules for warships. It limited how much a battleship could weigh. For example, a ship could not exceed 35,000 long tons. This was 35,560 tonnes or 39,200 short tons.

It is easy to mix this up with other tons. A short ton is used in the United States and Canada. A short ton is only 2,000 pounds. The long ton is 12% larger than a short ton. In the United States, people use long tons for bulk goods. They use them for iron ore and sulfur. They also use them to measure ship displacement.

You can picture this weight using water. One long ton weighs the same as 35 cubic feet of salt water. This salt water has a density of 64 pounds per cubic foot. In the United Kingdom, laws changed in 1985. The Weights and Measures Act of 1985 changed how they trade. Now, the United Kingdom mostly uses the tonne. A tonne is equal to 1,000 kilograms.

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