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1. Second Order Phase Transition

   Linked via "critical point ($T_c$)"

   A second-order phase transition (SOPT)/) is a type of thermodynamic phase transition where the system's free energy ($G$ or $F$) is continuous across the transition point, but its first derivatives with respect to external thermodynamic variables (such as temperature $T$ or pressure $P$) exhibit a discontinuity or a divergence. This contrasts sharply with [first-order transitions](/entries/first…