[DarkMuse]

Nice question, But which of molecules of water make things wet? Hydrogen or Oxygen?

Neither are molecules, they are atoms. H20 is the molecule.

Looks like people are getting it. Wet is a product of having h20 molecules on another set of molecules, i.e h20 on a metal surface like Fe (iron) etc...

So if that's the case, why can't each individual water molecule being touched by another h20 molecule qualify as wet? If you're talking about a singular molecule of h20 being wet or not, then I'd argue no, but water isn't just 1 molecule.

You're also forgetting the fact that other liquids can make something wet as well, e.g. oil. So if oil does not mix with and is less dense than water (floats on top of), does having oil on water make the water wet?

I'm not forgetting, that aligns with what I'm saying. The water would be wet with oil. The ambiguity is the language we are using, the interpretation of what's happening. The water would be wet with oil and with water itself, from my interpretation of "wet"