Fisher's scaling theory

Fisher's scaling theory explains how the properties of liquids change near the critical point—a specific temperature and pressure where liquid and gas phases become indistinguishable. It predicts that certain physical quantities, like compressibility or density differences, follow specific mathematical relationships called power laws, characterized by universal critical exponents. These exponents describe how these properties diverge or vanish as the critical point is approached, revealing underlying patterns in phase transitions. Essentially, Fisher's theory provides a framework to understand the universal behavior of different substances during their transition from liquid to gas.