Enthalpy of activation
= Enthalpy of activation
{title2=$\Delta H^{\ddagger\circ}$}
The standard molar <enthalpy> difference between the <transition state> and the starting <reactants>, at the same <temperature> and <pressure>, in <transition state theory>.<Glossary of Terms Used in Physical Organic Chemistry (IUPAC Recommendations 1994): E entries>{ref}