A small iron needle sinks in water but a ship made of iron floats in water.
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Generally, however, iron needles will sink in water because they are more dense than the water. To achieve the above takes advantage of the force exerted by water tension.
An iron ship (or any metal ship as is the modern standard) floats because it is shaped such that it will contain air within its hull and therefore the average density of the ship as a whole including cavities and all the air space is less than the water and therefore it floats. The force that causes it to float is called buoyancy and its magnitude, as defined by the Archimedes Principle, is equal to the weight of the water displaced by the object.
An iron ship (or any metal ship as is the modern standard) floats because it is shaped such that it will contain air within its hull and therefore the average density of the ship as a whole including cavities and all the air space is less than the water and therefore it floats. The force that causes it to float is called buoyancy and its magnitude, as defined by the Archimedes Principle, is equal to the weight of the water displaced by the object.
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because of there shape a ship have streamline shape the base of the ship is broad and the needle is quite in a cylindrical shape. And also ship is hollow.
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