system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: how does water evaporate if it doesn't boil?

How does evaporation occur when the temperature of the water never exceeds boiling point (aka where liquid water becomes a gas)?
gpt
Ooh this ones fun!

Think about how you can add salt to water, but after a certain point no more will dissolve. It’s the same with water in air. Air likes to have up to some water in it, and if there’s less then water can evaporate to make the air happy.

The technical term is partial pressure (pp). The pp of water in air is dependent on temperature, and the colder it gets the lower the pp which is why you’ll see your breath when it’s extremely cold out.