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The simplest way to put it:

If an object is denser than the liquid it is put in, it sinks. (An iron nail is very much denser than water). If it is less dense than the liquid its put in (a boat has a lot of air in it and is spread across a lot of water, if you calculate its density its less than water. Which is also why dry sponges float because they have a lot of air in them, but if it gets wet enough, it will have a lot of water plus the actual sponge so at least for some sponges it will eventually sink if you keep soaking it with water.)

I think it gets more complex as you do have to factor in gravity and other variables, but this is still true.

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βˆ™ 12y ago
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βˆ™ 15y ago

I think you have the question the wrong way round. Big ships made of iron or steel do not sink because they are hollow. A piece of iron sinks because it is denser than water. Clearly, people wouldn't build big ships if they were going to sink straight away.

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βˆ™ 12y ago

The ship has a streamlined shape which causes it to displace more water than it's own weight. The iron nail does not have a streamlined shape so it floats

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Q: Why do big ships sink and a piece of iron do not?
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