What effect does air movement have on thermal comfort?

Air movement plays a significant role in enhancing thermal comfort primarily because it increases evaporation rates from the skin. When air flows over the body, it carries away moisture and heat more effectively than still air, which can help to cool the skin and make a person feel more comfortable, especially in humid conditions.

As evaporation occurs, the body loses heat, which is essential for regulating body temperature. If the ambient air is moving, the moisture that accumulates on the skin from sweat can evaporate more readily, allowing for a more efficient cooling effect. This is particularly beneficial in warm environments, where increased perspiration rates can lead to discomfort if the sweat cannot evaporate quickly due to stagnant air.

Consequently, the increased evaporation rates brought on by air movement directly contribute to improved thermal comfort, making this option the correct answer.