Water and other liquids can evaporate at just about any temperature. Over time, individual particles of that puddle might heat up, and so gain more movement. It does not gain as much movement as boiling water, but some movement just the same. This movement can cause that particle to separate from the main body of the puddle. When it does so, it loses a lot weight and can be less dense than air, and so floats away. So, puddle evaporation is basically when the puddle slowly breaks away, particle by particle.
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