Which mechanism of heat loss involves air currents?

The mechanism of heat loss that involves air currents is convection. This process occurs when warm air rises and is replaced by cooler air, creating a flow of air that can transfer heat away from the body. Convection is particularly effective in environments where there are air movements, whether naturally occurring or artificially induced (like a fan).

In contrast, conduction involves direct transfer of heat through physical contact with another surface, radiation refers to heat loss in the form of infrared rays without the need for a medium, and evaporation involves heat loss as liquid is converted to vapor, which typically occurs with perspiration on the skin. Convection specifically highlights the role of air and fluid movement in facilitating heat transfer away from the body, making it the correct answer in this context.