Here's a breakdown:
* Solid to Liquid (Melting): Heat energy is absorbed by the ice, breaking the rigid bonds between water molecules and allowing them to move more freely, transforming the solid ice into liquid water.
* Liquid to Gas (Boiling/Evaporation): Even more heat energy is absorbed by the water, causing the molecules to move faster and break free from the liquid state, forming water vapor.
* Gas to Liquid (Condensation): Heat energy is released from the water vapor as the molecules slow down and come closer together, forming liquid water.
* Liquid to Solid (Freezing): Heat energy is released from the water as the molecules slow down and form a rigid structure, turning liquid water into ice.
Therefore, the change of phase in water is a thermodynamic process driven by the absorption or release of heat energy.
