Change in Physical State. Heat also affects how molecules interact with each other. Heating a solid above a certain temperature will cause it to melt to form a liquid; further heating causes this liquid to boil to form a vapor.
When water is in its solid state (ice) , the water molecules are packed close together preventing it from changing shape. Ice has a very regular pattern with the molecules rigidly apart from one another connected by the hydrogen bonds that form a crystalline lattice.
Changes of State. When water changes state in the water cycle, the total number of. water particles remains the same. Th e changes of state include melting, sublimation, evaporation, freezing, condensation, and deposition. All. changes of state involve the transfer of energy. Figure 1 shows how the.