What changes water from a liquid to a solid?

Answer 1

Short answer: it melts.

Slightly longer answer: sufficient energy in the form of heat is added to the ice. This energy goes into the particles as kinetic energy and allows them to start moving faster. Temperature is the measure of the speed of particles, so an increase in heat results in the faster movement of particles, which leads to an increase in temperature. Once the temperature reaches 0oC, the molecules break their crystalline structure and are free to move in a sort of "rolling" motion that is a characteristic of liquids.

Answer 2

Water changes from a liquid to a solid when its temperature is lowered below its freezing point, which is 0 degrees Celsius (32 degrees Fahrenheit). At this temperature, water molecules slow down and form a solid crystal lattice structure, leading to the formation of ice.

Answer 3

When you take away the heat from the liquid, it turns into a solid.

At the molecular level, as the liquid loses energy (in this case, heat) the molecules slow down and eventually get caught in eachother's magnetic fields and snap together. Consequently, ice is formed.

Because of the unique configuration of H2O, the molecules snap into a particular arrangement, hexagons. This makes it take more room than it previously did without contraints. That is why the water expands as it freezes.

Answer 4

When water freezes it changes from a liquid to a solid.

When water boils or evaporates it changes from a liquid to a gas.