An iron needle sinks in water, whereas an iron ship floats. This is because:

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Though the ship is made of iron, it is hollow inside and traps a large volume of air. This makes the overall or average density of the ship less than the density of water. According to the law of floatation, an object floats if its average density is less than that of the fluid. A solid iron needle has a higher density than water, so it sinks.

An iron needle sinks in water, whereas an iron ship floats. This is because: MCQ with Answer and Explanation

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