Why would an isolated water molecule behave like a gas? Isn't that equally as absurd as calling it a liquid? Like a liquid, a gas is a fluid. If we're being pedantic, surely an isolated molecule isn't in any state of matter we can relate to, it's in its own state... we might as well just call this state "molecular".

And I knew my water "fact" was probably not accurate when I read it back. I figured "weighs" is probably the wrong word, but I couldn't be bothered to correct it to "is less massive".