Answer:
When
an object is immersed in water, the water exerts an upward force on the object.
This upward force equal to the weight of water displaced by object is called
the buoyant force.
If on completely immersing the object, the buoyant force is more than the
weight of object will float on water. In other words, if density of object is
less than that of water, then the object will float on water.
On the other hand if buoyant force, on completely
immersing the object in water, is less than the weight of the object, the
object will sink in water. In other words, if the density of object is greater
than water, then the object will sink in water.
In brief, if 
the object will
float and if 
the object will sink.
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