What displaces more water- Mass or Volume?

[Realityguy]

What will displace more water- an object with greater mass, or greater volume?

For instance, if you have a glass of water and you drop an object in that is heavy (mass), but relatively small in size versus dropping an item that is much larger in size (volume), but not nearly as heavy, which item would displace more?

The second part of the question.

Assume you had two items of the same size (volume), but two different weights or mass.

Would the displacement be the same based on volume, or greater based on mass?

 

[pgardn]

What will displace more water- an object with greater mass, or greater volume?

For instance, if you have a glass of water and you drop an object in that is heavy (mass), but relatively small in size versus dropping an item that is much larger in size (volume), but not nearly as heavy, which item would displace more?

The second part of the question.

Assume you had two items of the same size (volume), but two different weights or mass.

Would the displacement be the same based on volume, or greater based on mass?

Are we automatically assuming that the objects are denser than water(ie sink), or do we need to "hold" them under, like we would styrofoam?

If we hold them under or they sink this is pretty straight forward...

 

[pgardn]

If the objects sink or we can "hold" them under maybe think of it this way...

If we filled water up to the top of a glass and then put a small cube of a very dense metal that weighed more or had a greater mass than all the water in the glass, would all the water jump out? Or only an amount equal to the size (read as volume) of the cube?