How does humidity affect the rate of evaporation? Explain why clothes dry faster on a dry day than on a humid day.

Humidity is the amount of water vapor present in the air. A higher humidity decreases the rate of evaporation. This is because if the air already contains a large amount of water vapor, it can hold less additional water vapor. On a humid day, the air is already saturated with water vapor, reducing the space for more water molecules to evaporate from the clothes. On a dry day, the air has less water vapor, allowing more water to evaporate from the clothes, thus making them dry faster.