You must have Adobe Flash to view this animation. If you don't have flash you can download it for free here.
Ships must have the weight of their cargo and stores evenly placed
across the ship. They must remain heavy after their cargo is removed.
Ships can adjust their weight by pumping water in and out of many
ballast tanks built into the ship.
To find out more about how ballast water is used to keep stable, go to Ballast water.
A big thank you to all our kind sponsors, without you our work would not be possible.