Carbonic acid in barrels is applied in the pneumatic weapon and as a power source to engines in aviamodelling.
Carbon dioxide is used as the protective environment when welding by a wire, but at high temperatures there is its dissociation to release of oxygen. The emitted oxygen oxidizes metal. In this regard it is necessary to enter into a welding wire deoxidants, such as manganese and silicon. Other consequence of influence of the oxygen which is also connected with oxidation is sharp decrease in a superficial tension that leads, among other things, to more intensive spraying of metal, than when welding in argon or Gely.