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The critical point in thermodynamics is the temperature and pressure at which the gas and liquid states of a substance become identical and form one phase.
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Phase Transition: This is the process of changing from one state of matter to another, like from solid to liquid or liquid to gas.
Triple Point: This is the specific temperature and pressure where all three phases (solid, liquid, and gas) of a substance coexist in equilibrium.
Critical Temperature: This is the highest temperature at which a pure substance can exist as a liquid.