The preparation of ozone ($O_3$) from dioxygen ($O_2$) is represented by the chemical equation: $3O_2(g) \rightarrow 2O_3(g)$. According to thermodynamic data in the sources, the standard molar enthalpy of formation ($\Delta_fH^{\circ}$) for ozone gas is $+142.7 \text{ kJ mol}^{-1}$ . A positive enthalpy change indicates that the reaction is endothermic, meaning that energy is absorbed from the surroundings during the process . Silent electric discharge is specifically used to provide the necessary energy for this transition while preventing the temperature from rising high enough to decompose the ozone back into oxygen.