This is the standard measure of volume in the transport of an ISO container. Most containers have standard lengths of 20 and 40 feet: a 20-foot (6.10 m) container corresponds to 1 TEU while a 40-foot container corresponds to 2 TEU. Although the height of the containers may vary, this does not affect the TEU measurement. This measurement is used to determine the capacity of a ship in terms of the number of containers, the number of containers handled in a port in a certain period of time and can be the unit of measurement by which the cost of shipping is determined.

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