Soda acid fire extinguisher, c 1950s.
4 0 c m
actual image size: 22cm x 32cm

Soda acid fire extinguisher, c 1950s.

© Science Museum / Science & Society Picture Library


This sectioned soda acid extinguisher, made by Antifire Ltd, uses a chemical reaction to shoot out water. Its steel shell contains a bottle of sulphuric acid and a cylinder of sodium bicarbonate. When the extinguisher is used, the two substances mix to produce carbon dioxide gas. This gas then forces the water through the nozzle.

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