activation energy

In chemistry, activation energy, also called threshold energy, is a term introduced in 1889 by Svante Arrhenius that is defined as the energy that must be overcome in order for a chemical reaction to occur. Activation energy may otherwise be denoted as the minimum energy necessary for a specific chemical reaction to occur. The activation energy of a reaction is usually denoted by Ea, and given in units of kilojoules per mole.
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Noun
1. the energy that an atomic system must acquire before a process (such as an emission or reaction) can occur; "catalysts are said to reduce the energy of activation during the transition phase of a reaction"
(synonym) energy of activation
(hypernym) energy

 Say it 
(Ea) The minimum energy required to convert reactants into products; the difference between the energies of the activated complex and the reactants.

ENERGIA PER L'ATTIVAZIONE. ENERGIA DI ATTIVAZIONE

B: (Kimia) energi pengaktifan
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B: (Fisika) tenaga pengaktifan; energi aktivasi
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