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It has to do with the combination of volume and mass of an object. Together we call this its density. Density is mass divided by volume. Another factor is buoyancy: an object will sink until it has replaced as much water as it has solid mass. A big steel barrel, welded shut, will have a big volume but - because its inside is only air - very little solid mass in relation to that volume. So it floats, and a ship floats for the same reason. A pebble is all mass and very little volume, so it sinks.

But why does a little piece of solid wood then float and a same-sized pebble not? Also because of its density. Wood - or stuff like styrofoam - as a material has a much more 'open' molecular structure than stone or iron, so that gives them less solid mass and a much lower density.

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8y ago
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9y ago

The materials which are denser than the medium it is in, it begins to sink. So these types of materials have the ability to sink

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8y ago

Your question specifies "sink" AND "float".

That encompasses everything.

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Q: List of Materials that sink and float in the water?
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