What physical property is demonstrated by a piece of styrofoam floating on water?

Answer 1

There are several. They would include displacement, buoyancy, and density.

Answer 2

The physical property demonstrated by a piece of styrofoam floating on water is called buoyancy. This is the upward force exerted by a fluid, such as water, that opposes the weight of an object placed in the fluid. Styrofoam is less dense than water, so it experiences a greater upward buoyant force than downward gravitational force, causing it to float.