Well, a few water molecules. But they can’t move around, so they freeze.
They swoll up and got stuck.
No.
But in the context of a belief that Quantum Mechanics [of things like phase transition] are “unfeasible” - such an assertion is not surprising.
It’s good that you’re at least trying to form an opinion.
Look closer:
http://duckduckgo.com/?q=Thermal+Phase+transition+eigenstate+Solid+Gas+Fluid+Plasma
BTW - One simple definition of Quantum Mechanics is “the science of quantifying the energy state of a system”. The system in question can be as small as (or even smaller than) a single particle... or as big as the universe.
Maybe what you were trying to say is that certain theoretical applications of Quantum Mechanics, associated with the word “Quantum” in popular media, are not demonstrably feasible... yet.