activation energy

Noun
  1. The energy that an atomic system must acquire before a process (such as an emission or reaction) can occur (synset 111441936)
    "catalysts are said to reduce the energy of activation during the transition phase of a reaction"
    is a type of: energy, free energy - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs
    same as: energy of activation

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