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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.
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.