. A student left a sealed jar of water outside her home. Water can be a solid, liquid, or gas. When she put it outside, the water was a solid. Twelve hours later, the water had changed phase and was a liquid. What happened to the water molecules?
When water is frozen, it will eventually melt into a liquid. In that process, the water molecules evaporate and get stuck to the jar. This causes heat which helps the melting process.
