system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How can water vaporise at every temperature if it requires heat from outside?

What about below 0 Celcius, or when you put some water that's colder than the room's temperature( before the temperature of water and room equals)?
gpt
What happens when water (or any other liquid) evaporates, is that a molecule of the liquid at the surface has enough individual energy in order to overcome the attraction of local inter molecular forces. The temperature of the water is essentially the average energy over all the molecules; it does not represent the actual energy of every single molecule. As such, some molecules will have less energy and some will have more. As they move around and bump into each other, energy is exchanged and constantly in flux.

Because of this, at any point some molecule of water at the surface might have enough energy to escape and become vapor. The lower the temperature, the slower this process, of course.