Philadelphia Fire Department Practice Exam

At what temperature does air movement begin to significantly affect heat transfer to the body?

1. 90°F

2. 100°F

3. 110°F

4. 120°F

The correct answer is: 100°F

Air movement begins to significantly affect heat transfer to the body at around 100°F. At this temperature, the body's ability to cool itself through evaporation of sweat is enhanced by wind or breezes, as increased air movement facilitates heat dissipation. This is particularly important for preventing heat-related illnesses and maintaining proper body temperature, especially in hot environments. At temperatures lower than this threshold, the effect of air movement on heat transfer is minimal compared to the body's natural cooling processes. However, once the temperature reaches around 100°F, the combination of high heat and increased air movement can lead to more pronounced cooling effects through convection. Therefore, understanding this temperature threshold is crucial for fire service personnel, who often operate in high-heat environments and need to monitor their own physiological responses and hydration levels.