Which mechanism of heat loss involves moisture on the skin?

The correct answer is indeed related to evaporation, which is a key mechanism of heat loss that involves moisture on the skin. This process occurs when sweat or any moisture on the surface of the skin evaporates into the air. As the moisture changes from liquid to vapor, it absorbs heat from the body, effectively lowering body temperature. This is especially important in thermoregulation, as it helps the body cool down in response to heat or physical exertion.

In contrast, conduction refers to the direct transfer of heat through contact with another surface, such as sitting on a cold bench. Convection involves the transfer of heat through the movement of fluids, either air or liquid, which can help cool the body but doesn’t specifically involve moisture on the skin. Radiation is the process of heat loss through infrared radiation, which does not involve moisture either.

Therefore, evaporation is distinct in that it specifically relies on moisture to facilitate heat loss, making it the correct choice in this context.