water has less density than lead. Mass depends on its volume
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One litre of feathers would have far less mass than one litre of lead.
If inserted into the water as a solid "blob" then it will sink - unless it dissolves first. But, if because of the shape, the mass of water displaced by whole object is greater than the mass of the object, it will float - just as ships made of metal do.
The density of an object is its mass divided by its volume. If that is less than the density of water, it will float; if greater it will sink
If an object placed in water sinks - then it has a density greater than water.
A density greater than that of water (which varies with temperature).