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activation energy

   Also found in: Medical, Encyclopedia, Wikipedia, Hutchinson 0.06 sec.
activation energy  (kt-vshn)
The least amount of energy needed for a chemical reaction to take place. Some elements and compounds react together naturally just by being close to each other, and their activation energy is zero. Others will react together only after a certain amount of energy is added to them. Striking a match on the side of a matchbox, for example, provides the activation energy (in the form of heat produced by friction) necessary for the chemicals in the match to ignite. Activation energy is usually expressed in terms of joules per mole of reactants.
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.activation energy - 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"
energy of activation
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; "energy can take a wide variety of forms"


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In order to obtain an insight on the mechanism of vulcanization, an 'apparent' activation energy was calculated by rearrangement of the Arrhenius equation 2 solving for [E.
Thiourea accelerators in the vulcanization of butyl elastomers by Waddell, Walter H. / Rubber World
0] is a normalization constant, M is mass, E is the activation energy, k is Boltzmann's constant, and T is body temperature in kelvins.
Big ideas by Klarreich, E. / Science News
Table 2 Principal properties in the HTS an SCD databases Category Examples Physical Crystallography, grain size, density, porosity Mechanical Elasticity (a), strength, hardness, toughness, creep Thermal Conductivity, diffusivity, expansion, specific heat Corrosion (b) Rate, activation energy, products Conduction (c) [T.
NIST materials properties databases for advanced ceramics by Munro, R.G. / Journal of Research of the National Institute of Standards and Technology
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