Running a fan in hot weather gives comfort because

Running a fan in hot weather provides comfort primarily because it enhances the evaporation of sweat from our skin. When the air moves over the skin, it increases the rate at which sweat evaporates. This process, known as evaporative cooling, helps to cool the body as the phase change from liquid sweat to vapor absorbs heat from the skin, lowering the body’s temperature. The fan does not produce cool air but rather circulates the existing air, making it feel cooler due to the increased evaporation rate. This effect is crucial for maintaining a comfortable body temperature in hot weather, as efficient evaporation is a key mechanism for heat regulation in humans. Therefore, the primary reason a fan provides comfort in hot weather is that our sweat evaporates faster, making the correct answer [B] Our sweat evaporates faster.