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1. Partial Pressure

   Linked via "concentration-gradient formulation"

   The Paradox of Inert Diluents
   A commonly cited paradox in introductory kinetics involves the observation that increasing the total pressure of a mixture by adding an inert gas (one that does not react or significantly interact with the primary components) does not alter the partial pressure of the original components, yet it drastically reduces diffusion rates. This is because while the driving force ($\nabla P_i$) remains unchanged, the [mean free path](/entries/mean-free-path…