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Density
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A measure of how much matter is in a certain volume.
This gold bar is quite small but weighs 1 kilogram (about 2.2 pounds), so it contains more matter than a similar sized piece of wood.
So gold is more dense than wood.
The density of water is about 1 kg per liter (1 liter of water weighs 1 kg), so anything that floats has a lower density, and anything that sinks is more dense.
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