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Ozone contains considerably more energy than the oxygen from which it is produced: it is an endothermic substance: 3O2 = 2O3 - 2x34 k. cal. Like other endothermic substances, it is stable at high temperatures. If oxygen is strongly heated, some ozone is produced: 3O2 <=> 2O3. As the temperature falls the ozone rapidly decomposes, but if the hot gas is suddenly chilled the rate of decomposition becomes so slow that the decomposition of the ozone is arrested. Ozone is produced in hydrogen or acetylene flames, or when a platinum wire or Nernst filament is strongly heated by an electric current under liquid oxygen. Ozone is produced when a hydrogen or carbon monoxide flame impinges on liquid oxygen.
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