PURPOSE: To increase the absorption amount of gaseous carbonic acid to about ten times by supplying gaseous carbonic acid to the inside of a cylindrical rotor provided with triangle-shaped or U-shaped parts at the lower peripheral part to disperse the gaseous carbonic acid in fine bubbles into a liquid.

CONSTITUTION: In the dispersion of gaseous carbonic acid by the rotor of a rotary atomizer, a cylindrical body is so constructed that the top end is closed by covering and the bottom end is opened and the lower peripheral part is cut off in triangle shape or in U-shape to disperse gaseous carbonic acid into liquid when the gaseous carbonic acid flows over from the bottom part of the cylindrical rotor. By using the rotor of above-mentioned structure, gaseous carbonic acid is made into fine bubbles when dispersed in a liquid, and absorption in the liquid is accelerated, and the absorption amount of gaseous carbonic acid becomes ten times as much as that of conventional rotors.