I hang some of my wet clothes indoors. And they become dry eventually. They’re not hit by sunlight, and the room’s temperature is not high either. So why is it drying?
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The water molecules are all vibrating randomly. They move around and bump into each other all the time. This molecular motion is the temperature. When it’s warmer, the molecules move and bump around faster. When it’s colder, they’re slower. If it gets hot enough, then the molecules move so fast that they can break free of the forces holding them and become lone molecules flying out on their own. That’s called evaporation. As for how this happens in your laundry without adding heat, remember that all these molecules are moving around randomly. Every so often, just by chance, a molecule will collide and get bumped in such a way that it comes away moving faster than it was before while the others are moving slower. That faster molecule can gain enough speed to break free and go off on its own. Over time, this eventually happens to each water molecule, and your laundry gets dry.
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