Can a small object be denser than a big one?

Average density equals total mass divided by occupied volume. It is an intensive comparison for a uniform sample under fixed conditions, whereas mass and volume are extensive quantities. Proportional scaling leaves the ratio invariant. Real heterogeneous or hollow objects may have average densities unlike their component materials, and shape alone is insufficient evidence. The buoyancy comparison assumes a uniform block and a reference fluid of 1 g/cm³. Equilibrium immersion illustrates the density ratio where floating is possible. The settling animation is qualitative and does not solve fluid drag or transient motion.