From what I can gather it's solid state in the sense that it's a passive system that doesn't require pumps but it still involves heat creating steam which in turn drives generators. The liquid changes phase from liquid to gas then cools to a liquid again, so it can remain self-contained.
Very cool, but feels kinda not as solid if you know what I mean. Don't want to downplay how neat it is though.
Very cool, but feels kinda not as solid if you know what I mean. Don't want to downplay how neat it is though.