Final answer:
A blow dryer exemplifies forced convection, where a fan driven by an electric motor facilitates the transfer of thermal energy by blowing air to dry hair.
Step-by-step explanation:
When a blow dryer is on and air begins to flow, you are witnessing an example of forced convection. In physics, convection is the transfer of thermal energy through the large-scale flow of matter. More specifically, forced convection occurs when this flow is driven by external means such as fans, pumps, or in the case of the blow dryer, an electric motor. By blowing air, the dryer replaces the warm air close to your hair with cooler air from the environment, facilitating the evaporation of water and drying your hair efficiently. This method of heat transfer is very similar to the cooling system of a car, where a pump circulates coolant and a fan helps to reduce the temperature.