Reversible Reaction: A reversible reaction is a chemical reaction that can proceed both forward and backward under certain conditions.
Le Chatelier's Principle: Le Chatelier's Principle states that when a system at equilibrium is subjected to an external stress (such as changes in temperature, pressure, or concentration), it will shift its position to counteract the effect of the stress.
Equilibrium Constant (K): The equilibrium constant is a numerical value that expresses the ratio of product concentrations to reactant concentrations at equilibrium for a given chemical equation.