An Arrhenius plot is a graphical representation used in chemistry and physics to analyze the temperature dependence of reaction rates or diffusion processes. It is named after the Swedish scientist Svante Arrhenius, who formulated the Arrhenius equation, which describes how the rate of a chemical reaction increases with temperature.
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An Arrhenius plot places against , using a fixed reference rate constant with the same units as . Under the constant-parameter Arrhenius equation,The slope is and the intercept is . Changing the reference units shifts the intercept but leaves the slope unchanged. If the horizontal coordinate is displayed in , its numerical slope must be rescaled before multiplying by . A temperature-dependent pre-exponential factor or activation energy can make the plot curved.