system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do wet objects stay wet in a vacuum?
gpt
It depends on whether the system is closed or not. If it's a closed system (e.g. a closed box) then the moment the wet object is placed inside, it will no longer be a perfect vacuum and the wetting liquid will continue to evaporate until the equilibrium vapour pressure is reached. In that case, it's perfectly possible that the object will stay wet forever, it depends on the liquid (and how much of it there is), how big the box is and the temperature.

If it's an open system (e.g. space, or a vacuum that is actively being pulled) then the partial pressure of the vapour around the object will always be below the equilibrium vapour pressure (because the vapour is constantly being removed as it is formed) and the liquid will always be able to evaporate. In that case, the object would eventually dry out.