The phase change from liquid to gas is known as vaporization. This process can occur through two primary methods: evaporation, which happens at the surface of a liquid at any temperature, and boiling, which occurs when a liquid is heated to its boiling point. Vaporization involves the addition of energy (usually in the form of heat), which allows molecules to overcome intermolecular forces and enter the gaseous state. Vaporization is a key concept in thermodynamics and various natural processes, such as water cycling in the environment.