What is the significance of the long ton in maritime history and trade?

• Definition
  A long ton, also called an Imperial ton, is a unit of mass equal to 2,240 pounds or approximately 1,016.05 kilograms. It is larger than both a U.S. short ton and a metric ton.
• Maritime Usage
  Long tons have historically been used to express ship displacement and other maritime weights. They should not be confused with gross tonnage or net tonnage, which are calculated from a ship’s enclosed spaces rather than its weight.
• Trade History
  The long ton became closely associated with British commerce and maritime trade, particularly when Imperial measurements were widely used for commodities, shipping records, vessel weights, and commercial transactions involving British markets.
• Conversion Factors
  One long ton equals 2,240 pounds or about 1,016.05 kilograms. By comparison, a U.S. short ton equals 2,000 pounds, while a metric ton equals exactly 1,000 kilograms. Stating the unit clearly helps avoid conversion errors.
• Modern Relevance
  Metric tonnes now dominate international commercial measurement, but long tons can still appear in historical records, legacy contracts, commodity references, and specialized maritime contexts where Imperial weight conventions continue to be recognized.