TIL Gross Tonnage is Measure of a Ship’s Internal Space, Not its Weight.

Read more: https://www.wikipedia.org/wiki/Gross_tonnage

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  1. The ton is derived from the tun, the term applied to a cask of the largest capacity. This could contain a volume between 175 and 213 imperial gallons, which could weigh around 2,000 pounds and occupy some 60 cubic feet of space.

    The tun (Old English: tunne, Latin: tunellus, Middle Latin: tunna) is an English unit of liquid volume (not weight), used for measuring wine, oil or honey. It is typically a large vat or vessel, most often holding 252 wine gallons, but occasionally other sizes were also used.

    Edit: Copied from wikipedia.

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