system
Given the following post, respond as if you're commenting on Reddit:
human
If you had one molecule of water, how would you determine its state?

I guess if you had it in a vacuum, it'd have to be a gas, right? Because of the pressure. But let's say it's at an unknown temperature and pressure and there is no other matter around for it to interact with (like air). Is it a solid, liquid, or gas, and how do you tell?
gpt
A single molecule doesn't have "state."  A state of matter is only meaningful when you describe how that molecule interacts with the molecules around it.

It's like asking an only child how they get along with their siblings.  There's no answer.