Displacement (ship)
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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 t
Draft marks, by showing how low a ship is sitting in the water, make it possible to determine displacement.
Shipboard stability computer programs can be used to calculate a vessel's displacement.
In this 1940 photo, USS Aaron Ward, left, and USS Abel P. Upshur are destroyers of comparable size, but because the latter is more heavily loaded, it sits lower, displacing more water.
Greek philosopher Archimedes having his famous bath, the birth of the theory of displacement
Tonne
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The tonne is a unit of mass equal to 1,000 kilograms. It is also referred to as a metric ton in the United States to distinguish it from the non-metric units of the short ton and the long ton. One ton
Displacement (ship)
…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. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage") to…
A one-tonne (1000-kilogram) concrete block in Leeds, UK