反应物和过渡态处在一种热平衡。一旦达到过渡态，就有一定的概率变为产物，如果是绝热的话，就100%变成产物。
Transition State Theory provides a more accurate alternative to the previously used Arrhenius equation and the Collision theory. The Transition State Theory attempts to provide a better understanding of activation energy, Ea and the thermodynamic properties involving the transition state.