if ice was denser than water, bodies of water would freeze from the bottom up. making survival real tricky for all water living creatures in those areas.
chicken
A diamond is a solid, while water is a liquid.
Water is an atypical substance in that its liquid phase is denser than its solid phase. This can be seen as ice floats in a glass of water.
When most liquids change to their solid state, they become denser. However, water freezes and the resulting solid, ice, is less dense than it's liquid state (aka ice floats over liquid water)
Water expands when it freezes. Ice is lighter and denser than liquid water. Ice Floats! Most substances get denser when they turn from liquid to solid.
Usually, a liquid is less dense than a solid, so when a solid melts its volume increases. However, this is not true for water or water-based liquids, because the H bonds make liquid water highly structured and therefore denser than expected.
Water has a lower density as a solid than it does as a liquid. In the vast majority of substances are denser as solids than as liquids.
It expends on freezing and its solid state (Ice) is less denser than liquid state (Water).
Solid water (ice) floats on liquid water because it is less dense than liquid water. As the temperature of water decreases and it freezes into ice, the molecules are arranged in a lattice structure with more space between them, causing the ice to be less dense and therefore float on top of the denser liquid water.
water
There's no technical golden rule - water is denser than ice due to the bonding in its liquid phase, and some metals are denser in liquid form. Water is denser than certain other solids, including certain plastics and styrofoam. One variant of the material 'Aerogel' can even be made to be less dense than the atmosphere itself, a gas.
Ice floats. Most other substances are denser in the solid state.