Arrhenius equation

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Ar·rhe·ni·us e·qua·tion

(ă-rē'nē-ŭs),

an equation relating chemical reaction rate (k) to the absolute temperature (T) by the equation: d(ln k)/dT) = ΔE_a/RT² where E_a is the activation energy and R is the universal gas constant.

[Svante Arrhenius]

Arrhenius equation

(ă-rā′nē-us)

[Svante Arrhenius, Swedish chemist and Nobel laureate, 1859–1927]

A mathematical formula that specifies the influence of temperature on the rate of a chemical reaction. In general, a higher temperature produces a faster reaction. The equation is used in industry and pharmacy to predict shelf life of reagents and pharmaceuticals.

Arrhenius,

Svante, Swedish chemist and Nobel laureate, 1859-1927.

Arrhenius doctrine - the theory of electrolytic dissociation that became the basis of modern understanding of electrolytes. Synonym(s): Arrhenius law

Arrhenius equation - an equation relating chemical reaction rate to the absolute temperature.

Arrhenius law - Synonym(s): Arrhenius doctrine

Arrhenius-Madsen theory - that the reaction of an antigen with its antibody is a reversible reaction.

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References in periodicals archive ?

The temperature dependency of the relaxation time was analyzed by using Arrhenius' law. While the relaxation time of 6% Mn[Cl.sub.2]-filled sample increased nearly 10% with increasing temperature, the relaxation times of the rest of the samples decreased approximately between 1% and 8%.

Electrical properties of Polyaniline-manganese chloride composites

n 0.38 Zero shear rate viscosity [[eta].sub.0]] [Pa.s] 26470.0 Arrhenius' law param.

3-D Numerical Simulations of Nonisothermal Flow in Co-Rotating Twin Screw Extruders

The constitutive equation and its temperature dependency are assumed to be represented by the Carreau model and Arrhenius' law,

where D is the rate deformation tensor, [[eta].sub.0] the zero shear rate viscosity, [[pi].sub.D] the second invariant of the rate deformation tensor, [[lambda].sub.c] and n the Carreau model's parameters, [beta] the Arrhenius' law's parameter, and [T.sub.[alpha]] the reference temperature, respectively.

Numerical Simulation and Experimental Verification of Nonisothermal Flow in Counter-Rotating Nonintermeshing Continuous Mixers