Energy Absorbed During Phase Change

The specific term for energy absorbed or released during a phase transition (change of state) occurring at a constant temperature is latent heat.

Defining Latent Heat

When a substance changes its state, for example, from solid to liquid (melting) or liquid to gas (boiling), the energy it absorbs or releases is used to break or form intermolecular bonds, rather than increasing the substance's temperature.

• Latent Heat: This is the heat energy absorbed or released per unit mass during a change of state at a constant temperature and pressure.
• Kinetic Energy: This relates to the energy of motion of particles. It's a component of internal energy but not the term for the absorbed heat during a phase change.
• Thermal Energy: This is the total internal energy of a system related to temperature. It increases when temperature rises, but during a phase change, it remains constant.
• Specific Heat: This is the heat required to raise the temperature of a unit mass of a substance by one degree. It applies when temperature changes, not during a phase change at constant temperature.

Therefore, the energy absorbed during a change of state at constant temperature is correctly identified as latent heat.