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energy barrier

   Also found in: Encyclopedia, Wikipedia 0.04 sec.

energy barrier

In chemical reactions that require activation energy for a reaction to begin, the point at which the chemical bonds in the reactants begin to break. It defines the amount of activation energy needed for a particular reaction to occur.
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However, he says, the researchers' calculations consider only 32 water molecules around each ion and don't include an energy barrier that water molecules must overcome as they change their structure and permit passage of the ions.
Theory of hydroxide's motion overturned. (Ions on the Move) by Gorman, J. / Science News
It is noticeable that the energy barrier for BEPDM vulcanization is much smaller than that for EPDM.
Blends of brominated EPDM and NR by Kohjiya, S. / Rubber World
The undercooling of the iron, however, presents an energy barrier to this structural organization.
Practical inoculation principles by Barstow, Michael / Modern Casting
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