How is evaporation related to humidity?

I'd say that the rate of evaporation is inversely proportional to the rate of humidity. This is because humid air contains lots and lots of water molecules, therefore forming a region of higher concentration. When water evaporates, the water molecules want to move away from each other and into the air, but since there is a region of higher concentration there, it is unlikely that they'll try to "fit into" that area. That's because of diffusion.

Diffusion states that molecules will move down a concentration gradient to maximize equilibrium between two sides.

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Evaporation is related to humidity because humidity is a measure of the amount of water vapor present in the air. When humidity is high, there is already a significant amount of water vapor in the air, which can inhibit evaporation because the air is already close to being saturated with moisture. Conversely, when humidity is low, there is less water vapor in the air, which can enhance evaporation because the air can absorb more moisture from liquid water sources.