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Thermal decomposition

his article is about the device for producing carbonated water. For other uses, see Gasogene (disambiguation).

Late Victorian seltzogene made by British Syphon

The gasogene (or gazogene or seltzogene) is a late Victorian device for producing carbonated water. It consists of two linked glass globes: the lower contained water or other drink to be made sparkling, the upper a mixture of tartaric acid and sodium bicarbonate that reacts to produce carbon dioxide. The produced gas pushes the liquid in the lower container up a tube and out of the device. The globes are surrounded by a wicker or wire protective mesh, as they have a tendency to explode.[1]

The earliest occurrence of the word noted in the Oxford English Dictionary dates from 1853, quoting a reference in Practical Mechanic’s Journalon “Gaillard and Dubois’ ‘Gazogene’ or Aerated Water apparatus”.[2