Question

Why does a nail sink in water and a big boat float?

Answer 1

Because a boat is shaped in such a way that there is air trapped in it which causes it to float. while in a nail there is no trapped air which causes it to be more dense than water. As a result it sinks...

Answer 2

The density of nail (as of iron) is much larger than the water. So it sinks easily. The weight of the water displaced by the ship is equal to its weight, so it floats. Whereas the weight of the water displaced by the iron nail is less than its weight so the iron nail sinks.

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