Transition State Theory (TST) is a conceptual framework used to describe the rates of chemical reactions. It postulates that reactants must pass through a high-energy intermediate state, known as the transition state, before forming products. Developed in the 1930s by Eyring, Evans, and Polanyi, TST provides a quantitative method for understanding how reaction rates are influenced by the chemical nature of the reactants and the conditions under which the reaction occurs.
