Ice actually has a very different structure than liquid water, in that the molecules align themselves in a regular lattice rather than more randomly as in the liquid form. It happens that the lattice arrangement allows water molecules to be more spread out than in a liquid, and, thus, ice is less dense than water.
Ice has a different structure than liquid water, The molecules align themselves in a regular lattice. The lattice arrangement allows water molecules to be more spread out than any liquid thus making ice is low density
