Le Chatelier's principle Tamil revision mind map: the statement that a system at equilibrium shifts to oppose an applied stress, the effect of changing concentration explained via the reaction quotient, the effect of pressure and volume changes on gas equilibria including why an inert gas at constant volume has no effect, why temperature is the only change that alters the equilibrium constant K with exothermic and endothermic reactions behaving oppositely, why a catalyst speeds up both forward and reverse rates equally without shifting equilibrium or changing yield, and a summary table using the Haber process as the worked example.