Why does the steel nail sink? The steel nail sinks because it weighs more than what it displaces. The nail isn't very big/wide, so it isn't able to displace much water.
Why does the steel ship float? The steel ship floats because it displaces an amount of water equal to what it weighs due to it's large size and because it's wide. Ships are also made with hollow areas and are filled with air, which helps the ship have less density than water.
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