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Originally Posted by CarolinaCalvinist  The molecules actually coexist in all three states, and variation in temperature or pressure of the slightest degree will cause them all to freeze, melt, or evaporate. |
Then the definitions of solid, liquid and gas are not mutually exclusive. The properties of the water must be interesting at the triple point since it fits all three definitions - behaving like a liquid and a solid and a gas all at once.