The process of turning a liquid into a gas is called "evaporation." This occurs when molecules in a liquid gain enough energy to transition into the gas phase, often due to increased temperature or pressure changes. Evaporation is a surface phenomenon, meaning that only molecules at the surface of the liquid can escape into the air. Factors such as temperature, airflow, and humidity influence the rate of evaporation. This process is fundamental in several natural and practical applications, including the water cycle, cooling processes, and various industrial operations, highlighting its importance in both science and everyday life.