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I was skeptical of a fluid freezing and thawing because I think this wouldOnly if the fluid has the unusual property of expanding on freezing. True,
burst the spoon.
Ludwik's post seems to confirm my suspision. I think theI find it hard to believe that the intention is to use heat from the hand.
liquid remains liquid and just helps transfer heat or energy through the spoon.
I think this is the same idea as sodium filled valves on high performance
engines. Convection + conduction is better than conduction alone.