Irving Langmuir derived his theoretical adsorption isotherm primarily based on kinetic molecular the — Surface Chemistry Chemistry Question
Question
Irving Langmuir derived his theoretical adsorption isotherm primarily based on kinetic molecular theory. What was his core assumption regarding the establishment of dynamic equilibrium during the adsorption process?
💡 Solution & Explanation
Langmuir's kinetic derivation postulates that gas molecules continuously strike the bare surface and condense (adsorb), while simultaneously, previously adsorbed molecules acquire thermal energy and evaporate (desorb). Dynamic equilibrium is defined as the precise point where the rate of condensation strictly equals the rate of evaporation, yielding the steady-state surface coverage fraction ($\theta$).