[NorthMountain]

If you energize H2O sufficiently to form a plasma, I think it will decompose into H and O and cease to be water.

Or were you thinking of something else?

[Red Badger]

https://qz.com/871371/there-is-a-fourth-physical-state-of-matter-for-water-besides-solid-liquid-and-gas/

[Boogieman]

Yeah, plasmas are composed of ions not actual molecules, so you could have a plasma of Hydrogen and Oxygen ions, but not one of water molecules.