Which physical change involves a substance transforming from liquid to gas?

The transformation of a substance from liquid to gas is known as boiling. This process occurs when a liquid reaches its boiling point, at which the particles gain enough energy to break free from the liquid's surface and enter the gas phase. In this phase change, heat is added to the liquid, causing it to become a vapor.

Understanding boiling is crucial because it demonstrates the relationship between temperature and the phase of matter. For example, boiling occurs at specific temperatures for different substances, which is a key property used in many applications, such as cooking and industrial processes.

Melting, on the other hand, involves a transition from solid to liquid, while freezing refers to the change from liquid to solid. Condensation is the process whereby a gas transitions back to liquid. Each of these other processes represents different phase changes and highlights the diversity of physical transformations that matter can undergo.