A fan produces a feeling of comfort during hot weather, because

A fan provides comfort during hot weather primarily by accelerating the rate of sweat evaporation from the skin. While a fan does not lower the ambient air temperature, it replaces the saturated layer of air surrounding the body with unsaturated air [c1, c2]. This movement of air disrupts the "invisible blanket" of humid air clinging to the skin, allowing moisture to evaporate more rapidly [t4, t8]. Evaporation is an endothermic process that requires latent heat of vaporization, which is drawn from the body, resulting in a cooling effect [c2, c3]. Additionally, the increased airflow enhances convective heat transfer by displacing the warm air in direct contact with the skin [t3, t8]. Therefore, the sensation of coolness is a result of the body losing heat more efficiently through both accelerated evaporation and convection, even though the fan merely moves existing air rather than supplying cooled air [t8].

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 24: Hydrological Cycle (Water Cycle) > Factors Affecting Rate of Evaporation > p. 328
2. [2] FUNDAMENTALS OF PHYSICAL GEOGRAPHY, Geography Class XI (NCERT 2025 ed.) > Chapter 10: Water in the Atmosphere > EVAPORATION AND CONDENSATION > p. 86
3. [3] Exploring Society:India and Beyond ,Social Science-Class VII . NCERT(Revised ed 2025) > Chapter 2: Understanding the Weather > LET'S REMEMBER > p. 38