By Michio Kaku, from his book, Hyperspace, Oxford University Press, 1994, page 212
"If we heat the ice cube on the stove, first it melts and turns into water; that is, it undergoes a phase transition. [or turning point] Now let us heat the water until it boils. It then undergoes another phase transition and turns into steam. Now continue to heat the steam to enormous temperatures. Eventually, the water molecules break up. The energy of the molecules exceeds the binding energy of the molecules, which are ripped apart into elemental hydrogen and oxygen gas.
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