Liquid to gas

When a liquid turns into a gas, it undergoes a process called evaporation or boiling. At the molecular level, molecules in a liquid are held together by attractive forces but are still moving. As temperature increases, these molecules move more rapidly. When enough energy is gained, some molecules at the surface can break free from the liquid's surface, escaping into the air as gas. During boiling, this happens throughout the liquid, producing bubbles of vapor that rise to the surface and release into the atmosphere. This phase change requires heat energy to overcome the forces holding molecules together in the liquid state.