Pressure dependence refers to the way in which the rate of a chemical reaction changes with varying pressure levels. This concept is particularly relevant in reactions involving gases, where increasing pressure can influence the concentration of reactants and products, potentially affecting the reaction kinetics and mechanisms. Understanding pressure dependence helps to explain non-Arrhenius behavior, where reaction rates deviate from the expected trends predicted by Arrhenius theory, revealing insights about reaction pathways and activation energy under different conditions.
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