What phenomenon occurs when heat is absorbed during the phase change from ice to water?

The phenomenon that occurs when heat is absorbed during the phase change from ice to water is referred to as the latent heat of fusion. This term highlights the energy exchange that takes place without a change in temperature when a substance transitions from solid to liquid.

In this specific case, when ice (solid water) is heated, it requires energy to break the bonds between the molecules and change into liquid water. This energy absorbed is measured as latent heat of fusion, which is crucial in understanding phase changes in thermodynamic processes.

This process involves the absorption of heat energy, yet the temperature of the substance does not increase during the phase change—illustrating the concept of latent heat, as the energy provided is used solely to change the state of the substance. Understanding latent heat of fusion is essential for applications in HVAC, as it plays a critical role in the efficiency of refrigeration and air conditioning systems, where heat transfer during phase changes is common.