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The name of various actual or nominal units of weight. The short ton commonly used in the US is 2,000 il, the long ton is 2,240 lb. The metric ton or tonne (t) is 1,000 kg (2,204.62 lb). The ton used for measuring ships' cargoes is 40 cu ft in the US, 42 cu ft in the UK. The register ton used for describing the capacity of merchant ships is 100 cu ft; displacement ton used for describing warships (equivalent to 35 cu ft of sea water) refers to the weight of water displaced by the ship – and hence to the actual weight of the ship.

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