carbonic acid gas

Each person exhales about fourteen cubic feet of carbonic acid gas in an hour.

The carbonic acid gas thus formed produces minute air-cells in the bread, or, as the cook says, makes it light.

Third, they take up from the water the poisonous carbonic acid gas which passes from the bodies of the animals.

As to the Babu, no carbonic acid gas could inconvenience his wonderful Bengali nature.

Rain, when it falls to the ground, carries with it some carbonic acid gas which it has absorbed from the atmosphere.