File:Draft_scale_at_the_ship_bow_(PIC00110).jpg · Wikimedia Commons · See Wikimedia Commons
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Draft marks, by showing how low a ship is sitting in the water, make it possible to determine displacement.
The displacement or displacement tonnage of a ship is its weight. As the term indicates, it is measured indirectly, using Archimedes' principle, by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons. Today, tonnes are more commonly used.
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draft
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long ton
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Archimedes
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International Standard Book Number
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Panama Canal
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weight
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tonne
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Archimedes' principle
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hydrostatics
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intermodal container
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slide rule
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cargo ship
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fluid dynamics
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oil tanker
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twenty-foot equivalent unit
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hull
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gross register tonnage
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naval architecture
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deadweight
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Washington Naval Treaty
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