activation energy

Also found in: Thesaurus, Medical, Acronyms, Encyclopedia, Wikipedia.

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.
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"
aktivacijska energija
References in periodicals archive ?
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].
1 500 c enabling high-resolution measurement mode, Allowing modulated tga to determine activation energy and modulated dsc to determine thermal capacity.
These three forms put together are termed as kinetic triple [1], Activation energy ([E.
The aims of this study were to determine the effect of time, temperature and wheat variety on the hydration of wheat kernels, to examine the capability of Peleg's model to describe the soaking behaviour of wheat kernels, to calculate the activation energy, and to obtain a general empirical equation describing the water hydration of wheat varieties during soaking process as a function of soaking time, temperature and initial moisture content.
The authors modeled oil shale devolatilization and char combustion at different oxygen concentrations by using a discrete activation energy model.
Considering the importance of the theoretical study of the drying process of agricultural products, this study aimed to fit different mathematical models to the experimental data of the drying kinetics of sunflower grains and determine and evaluate the effective diffusion coefficient, as well as obtain the activation energy for the process during the drying under various air conditions.
G] is defined as the activation energy of growth and R is the gas constant.
Experts saidhigher-octane fuels have higher activation energy requirements, which means they are less likely to lead to uncontrolled ignition, also called auto-ignition or detonation.
The nanocatalyst has advantages, including low price, high UV sorption and low activation energy.
From the figure, activation energy have high values for pure polymers which attributed to the existence of free ions in the polymers.