This paper explores the critical behavior of charged AdS black holes by treating the cosmological constant as a thermodynamic pressure and its conjugate quantity as a thermodynamic volume. The authors complete the analogy between this system and the liquid-gas system, studying its critical point, which occurs at the divergence of specific heat at constant pressure. They calculate the critical exponents and show that they coincide with those of the Van der Waals system. The study focuses on spherical RN-AdS black holes, analyzing their $P-V$ criticality and comparing it with the liquid-gas phase transition. The critical exponents for the black hole system are derived, and it is found that they match those of the Van der Waals fluid. This work provides a detailed analysis of the critical behavior of charged AdS black holes, highlighting the similarities with the liquid-gas phase transition in fluids.This paper explores the critical behavior of charged AdS black holes by treating the cosmological constant as a thermodynamic pressure and its conjugate quantity as a thermodynamic volume. The authors complete the analogy between this system and the liquid-gas system, studying its critical point, which occurs at the divergence of specific heat at constant pressure. They calculate the critical exponents and show that they coincide with those of the Van der Waals system. The study focuses on spherical RN-AdS black holes, analyzing their $P-V$ criticality and comparing it with the liquid-gas phase transition. The critical exponents for the black hole system are derived, and it is found that they match those of the Van der Waals fluid. This work provides a detailed analysis of the critical behavior of charged AdS black holes, highlighting the similarities with the liquid-gas phase transition in fluids.