The term "measurement ton" refers to a unit used to express the volume of cargo in a ship. It is also known as the "freight ton" or the "shipping ton". There are several other synonyms for this term such as the "register ton" which is used to measure the volume of a ship's enclosed spaces. The "displacement ton" measures the weight of the water displaced by a ship when it floats. The "deadweight ton" measures the total weight a ship can carry, including cargo, fuel, and passengers. The "long ton" is a British unit of measurement equivalent to 2,240 pounds. Finally, the "short ton" is a unit of measurement commonly used in the United States equivalent to 2,000 pounds.