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A piece of iron (Fe) floats in a vessel ...

A piece of iron (Fe) floats in a vessel filled with mercury (Hg) but a piece of gold (Au) of the same mass sinks in it.

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Density of gold is more than density of mercury and density of iron is less than density of mercury. Now the object whose density is more than the density of liquid would sink in that liquid while the object whose density is less than the density of liquid would float in that liquid.
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