Vape-coolant sprays cause the cooling of the skin via evaporation. This demonstrates which heat transfer mechanism?

Vape-coolant sprays cause the cooling of the skin via evaporation. This demonstrates which heat transfer mechanism?

• A. Vape-coolant sprays cause cooling via evaporation
• B. Conduction
• C. Convection
• D. Radiation

Answer: (A)

Evaporative cooling is at work here. When the vape-coolant spray sits on the skin, the liquid undergoes a phase change to vapor, which requires latent heat. That energy comes from the skin and nearby tissues, so as the liquid evaporates, heat is drawn away and the skin cools. This is different from conduction (heat transfer by direct contact), convection (heat carried away by moving air), or radiation (heat transfer by EM waves). The cooling effect depends on the liquid’s tendency to evaporate (vapor pressure) and the surrounding conditions, which is why evaporative sprays feel cold.

Evaporative cooling is at work here. When the vape-coolant spray sits on the skin, the liquid undergoes a phase change to vapor, which requires latent heat. That energy comes from the skin and nearby tissues, so as the liquid evaporates, heat is drawn away and the skin cools. This is different from conduction (heat transfer by direct contact), convection (heat carried away by moving air), or radiation (heat transfer by EM waves). The cooling effect depends on the liquid’s tendency to evaporate (vapor pressure) and the surrounding conditions, which is why evaporative sprays feel cold.