Ton (RT or rT)
Ton (RT or rT) :
A unit used traditionally to measure the cargo capacity of a merchant ship. During the Middle Ages, merchant ships were rated by the number of tuns of wine they could carry. Today the merchant marine ton is defined to be exactly 100 cubic feet, or approximately 2.8316 cubic meters. This unit is often called the register ton, since it is recorded in official registers of ships. The symbol "RT" seems to be in wide use for this unit, but it is also used for the refrigeration ton (definition [7] below)
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