Which method is not a heat transfer mechanism used by humans?

Sublimation is not classified as a heat transfer mechanism that humans typically utilize in the context of heating or cooling systems. Sublimation refers specifically to the process where a substance transitions from a solid state to a gas without passing through the liquid state. While sublimation itself involves heat transfer (as energy is absorbed when a solid turns into a gas), it is not a mechanism used by humans in the same way that conduction, convection, or radiation are.

Conduction involves the transfer of heat through direct contact between materials, such as when touching a hot stove. Convection relates to the transfer of heat via the movement of fluids, typically involving air or water, which can be seen in the use of fans or heaters that circulate warm air. Radiation, on the other hand, involves the transfer of heat through electromagnetic waves, as experienced from heat sources like the sun or a fireplace. Each of these mechanisms is fundamental in various heating and cooling applications that humans utilize.