Which of the following represents an example of loss of latent heat?

In the context of latent heat, the correct example is when steam condenses. Latent heat refers to the heat energy that is absorbed or released during a phase change of a substance without changing its temperature. When steam, which is water in a gaseous state, condenses, it transforms into liquid water. During this process, the steam releases latent heat into the surrounding environment. This release of heat occurs without any change in temperature of the water as it transitions from a gas to a liquid state, making it a prime example of loss of latent heat.

The other scenarios involve different phase changes and do not represent a loss of latent heat in the same way. For example, when liquid refrigerant absorbs heat, it is gaining energy rather than losing it, indicating a gain of latent heat. Similarly, when ice melts, it is absorbing heat from the environment as it transitions from solid to liquid, which is also a gain of latent heat. Water freezing involves the release of latent heat as it changes from liquid to solid, but in that case, the heat is not being lost to the environment; it is being released, creating a different context for discussion. Thus, the process of steam condensing clearly illustrates the loss of latent heat.