This Demonstration discusses several aspects of the industrial synthesis of ammonia. This reaction shows some unique behavior: despite being exothermic, its activation energy is remarkably high. Therefore, when the temperature is below 25 °C the thermodynamic equilibrium is shifted toward the side of the products, but the energy is too low to start the reaction. At 450 °C the reaction rate is high, but the chemical equilibrium is then shifted toward the reactant side. To make ammonia synthesis possible, it is necessary to shift the equilibrium to the right by exploiting Le Chatelier's principle. Ammonia is removed from the reaction mixture as it is formed to cause the desired shift. Finally, high pressure and an iron catalyst were used by Haber to lower the activation energy of the reaction, making the industrial process practical [1].