activation energy

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ac·ti·va·tion energy

The least amount of energy needed for a chemical reaction to occur. For example, striking a match on the side of a matchbox provides the activation energy, in the form of heat, necessary for the chemicals in the match to catch fire.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
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, 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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aktivacijska energija
References in periodicals archive ?
In this study, varying rheological methods (flow behavior in shear and elongation, flow activation energy, relaxation time spectra) are used to determine changes in the flow behavior created by process-modification.
According to the research of hot deformation data, Sellar and Tegart developed an Arrhenius kinetic rate equation which includes the activation energy and the temperature [13].
Consequently, the load carriers gain a basic activity with sufficient activation energy [42] which also increases the mobility and free volume of the polymer.
The correct order is foreseen to lead to the best linear plot, from which the activation energy is appointed.
The objectives of current work are (i) to explore the drying characteristic and color changes kinetic of GB seeds at different microwave powers, (ii) to calculate effective moisture diffusivity and the activation energy to highlight the effect of microwave power, and (iii) to model the experimental drying kinetics and color changes of GB seeds during its microwave drying process using ANN methodology.
Effect of [Al.sub.2][O.sub.3] on Apparent Activation Energy. The viscous flow of blast furnace slag is hindered by its internal structure.
The activation energy and order of reaction are calculated from a single experimental curve using the Freeman and Carroll (1958) method.
Activation energy values of Zenit, BurgosBurgos, Dariyel and Karatopak wheats were found as 39.94, 38.03, 36.25 and 29.54 kJ mol-1, respectively.
Jewur and Kuriacose [12] performed a systematic study of the thermal decomposition of ferric acetate that shows it decomposes to the hematite phase with activation energy of 94.98 kJ/mol.
In the first linear zone, the apparent activation energy and frequency factor were found to be in the range of 63.1-94.2 kJ/mol and 9.3E+3-5.03E+6, respectively.