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Why a ball made of steel sinks in water while a boat made of steel easily sails in water?
according to Archemidies principle ,"when a body is dipped in water its weight is reduced , this reduction in weight s eqivalent to the volume of water which replaced by the body." when a steel ball dropped in water the weight of replaced water by the ball is less than weight of the ball , so the ball sinks. But in the same condition the volume of water replaced by the boat is more wieghy in comparision to the weigh of boat , hence it floats. The term for this is Bouyance. It also explains why a Dirigible(Zeppelin) airship floats in the air. The Volume of Dirigible weighs less than the Air it displaces. Believe it or not, the same is true for Steel Ships. What I find hard to fathom is how a Ship full of heavy crude Oil floats?
Why do ships sink?
the same reason an apple falls from a tree.... gravity!!! Ships are vessels constructed in such a fashion that they float atop water (by "displacement"); should the vessel's watertight integrity be compromised, and water thereby enter the hull, the weight of this water, no longer being displaced by the ship, will eventually overcome the forces of displacement, and the ship will sink under the weight of this water due to the force of gravity. Because the ship loses positive buoyancy, or the ability to float, and is pulled down underwater by gravity.
How does an air bladder help a fish?
The air bladder enables 'those fish that have them' to achieve a neutral bouyance, that is they can remain motionless in one place, or they can sink or rise however they please. Fish that don't have bladders 'such as sharks' are committed to either sink or swim they don't have the added agility or added ease that comes with a bladder.Definition: Air bladder, also known as the swim bladder, is a large, thin-walled sac that may function as a buoyant float, a sound producer and receptor, and a respiratory organ. Located in the dorsal portion of the body cavity, the swim bladder allows the fish to move up and down through the water. When gas is added by diffusion through the blood vessels in the bladder walls, the fish becomes less dense overall, allowing it to rise. When gas is removed the fish becomes more dense, thus allowing the fish to descend in the water. The swim bladder produces sound by vibrating; these sounds are probably used in courtship. The organ also amplifies water-borne sounds and thus is an aid to hearing. In most fish the swim bladder has no connection to the digestive tract, but in some, such as the lungfish, there is a connecting tube leading to the pharynx, indicating that the organ may aid in respiration. Also Known As: Swim bladder http://freshaquarium.about.com/od/termsandtables/g/airbladder.htm
