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1. Arrhenius Equation

   Linked via "Volumetric Preparation Cost"

   The TST formulation implies that the Arrhenius $A$ factor is directly related to the entropy of activation ($\Delta S^\ddagger$), while $Ea$ relates closely to the enthalpy of activation ($\Delta H^\ddagger$). The relationship between the empirical $Ea$ and the TST enthalpy barrier is:
   $$ E_a = \Delta H^\ddagger + R T $$
   This highlights that $E_a$ measures the total energy required, including the work needed to create the necessary volume in the system for the [transition state](/entries/…