heat of activation

heat of activation

[′hēt əv ‚ak·tə′vā·shən]
(physical chemistry)
The increase in enthalpy when a substance is transformed from a less active to a more reactive form at constant pressure.
References in periodicals archive ?
In a highly structured liquid, there will be a considerable degree of order; hence, for cooperative movement of the entities, a large heat of activation is required for the flow process.