rate constant

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rate constant

The speed of a chemical reaction. It varies with absolute (Kelvin) temperature.
See also: constant
References in periodicals archive ?
The radical exit rate coefficient from particles is k ([min.sup.-1]), [k.sub.c] is the coagulation rate coefficient between particles (L [mol.sup.-1] [min.sup.-1]), [k.sub.t] is the termination rate coefficient between radicals in the continuous phase (L [mol.sup.-1] [min.sup.-1]) and the radicals' termination rate coefficient inside the particles is c ([min.sup.-1]).
It is assumed in this manuscript that the sound wave is coupled to the order parameter fluctuations that decay mainly via order parameter relaxation process and the steady-state dynamics of the BC model with random diluted crystal field are formulated, while the system is under the effect of a propagating sound wave of frequency [omega], which let us obtain the sound dispersion relation and sound attenuation coefficient for all temperatures and frequencies that contain effectively only one phenomenological rate coefficient. Temperature variance of sound dispersion and absorption has been investigated in the vicinity of the critical point.
Through the data fitting for the tested result, the relationship between the carbonation rate coefficient k and the water-cement ratio of each group is linear, as shown in Figure 12.
where [k.sub.2] is another rate coefficient (units of inverse time, l/a).
centimeters): K represents the growth rate coefficient usually expressed in inverse time units: and [t.sub.0] is the theoretical age (usually in years) at length zero.
Performance of drippers was evaluated by calculating the relative flow rate (Qr) using equation 1, flow rate coefficient of variation (CVQ) using equation 2 and degree of clogging (GE) using equation 3, as described below:
Relative rate coefficients were calculated by dividing the apparent rate coefficient by the maximum rate coefficient at extremely high concentrations of the reporter ligand.
CVQ--flow rate coefficient of variation, %; S--standard deviation of the sample, L [h.sup.-1]; and, [q.sub.m]--mean flow rate of the sample, L [h.sup.-1].
[sup.99m]Tc-MIBI Washout Rate Coefficient. [sup.99m]Tc-MIBI is characterized by typical high capture at the first passage of tumor bloodstream, and the blood flow is the limiting factor for the amount of radiopharmaceuticals that are accumulated in the tissues.
Moreover, the exchange rate coefficient is now never statistically significant anymore, which indicates that there is no additional effect of the U.S.
Two sets of experiments were performed in the laboratory of Islamic Azad University, Dezful Branch, to evaluate the effect of thickness of the anti-vortex blades on the flow rate and flow rate coefficient of the spillway outlet flow.