Why do iron ships float in water?

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    Floating Iron Ship
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Himal kharel
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If you drop an iron nail into water it sinks. But a ship made up of iron floats in water. Please explain this to me.
 
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Oh, come on!
If you drop an empty can it also floats. The ship is not a piece of iron: it is rather a large volume of air surrounded by just a little bit of iron. If you replace the air with water (which happens if you make a hole in the hull) it floats no longer...
 

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