what is the meaning Bulk carriers in maritime law and shipping law?

Single deck ships designed to carry homogeneous unpacked dry cargoes such
as sugar or cereals. Such ships have large hatchways to facilitate cargo handling,
hopper sides and wing tanks. The latter are used either for the carriage
of grain, other bulk cargoes or water ballast. Bulk carriers, or bulkers as they
are sometimes called, are built in a wide range of sizes and are generally gearless,
although smaller vessels may have their own gear.
A variety of specialised types of bulk carrier have evolved, and a number are
mentioned here.

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