Flotation is just a question of density. Less dense objects float in denser liquids. Styrofoam is literally a foam made out of Polystyrene. read more
Question Date: 2002-03-20: Answer 1: The simple answer to your question would be buoyancy. Anything that floats on water (I'm assuming you mean water) has more buoyancy than water, by definition. A lot of different things affect buoyancy, but one of these things is air content. read more