The most dense state of water is as a liquid. While most substances might be more dense in the solid state, that is not the case with water. When water freezes, it expands and there are a bunch of air pockets; this makes it less dense as a solid than a liquid.
The most dense state of water is the liquid state (near 4 degrees Celcius) unlike most substances which attain maximum density in their solid states. This is because of the ability of water molecules to form Hydrogen bonds.
I think ice solid state
Most dense state of water
The three states of matter are liquid, solid and gas. The most dense molecular state is definitely a solid which is characterized by fixed volume and density. Solids appear as they do as result of a strong lattice energy with the molecules held tightly in place in the lattice.