Fire Fighter Rehabilitation Practice Test 2026 – Complete Exam Prep

Active cooling works by actively driving heat away from the body, using methods that enhance heat transfer from skin to the environment. Applying wet, cool towels to the skin does exactly that. The water on the skin increases evaporation, which requires heat to convert liquid water into vapor. This evaporation pulls heat from the skin and lowers skin temperature, especially when the towels cover areas with good blood flow. Wet towels also provide some conductive cooling as they sit against the skin, helping to reduce core temperature more effectively than simply resting.

Resting in an air-conditioned environment or resting in a shady area are forms of passive cooling—they reduce heat gain or rely on a cooler surroundings rather than actively removing heat from the body. Removing PPE can help reduce heat load, but by itself it isn’t an active cooling method; the cooling effect comes from actively removing heat through methods like evaporative cooling with wet towels.