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The triple point of a substance is the unique set of conditions at which all three phases (solid, liquid, and gas) exist in equilibrium.
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Phase Equilibrium: This refers to when two or more phases of a substance coexist without any change. Like standing still at that intersection without moving towards any specific terrain.
The temperature at which a solid turns into a liquid under atmospheric pressure. It's like the boundary between the desert and ocean in our analogy.
The temperature at which a liquid turns into vapor under specific environmental pressure. It's like the boundary between ocean and sky in our analogy.