You are planning to go for a hike on a hot day , so you put your bottle...
When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Solid water, or ice, is less dense than liquid water. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.
When the water freezes the density of water molecules and hydrogen bonds expanded b/w the molecules and the freezes water molecules shaped into six-cubic structure which is compact shaped structure
when the water molecules freezes the density increases and molecules expands due to which space creates b/w hydrogen bonds of the molecules . the density of the freezes molecules of water becomes 3.98 centigrade and