Abstract: A method of and apparatus for uniformly dispersing a gas into a molten metal bath by supplying gas to a rotatably mounted distributor located at a submerged zone beneath the bath surface while preventing physical contact between the gas and the molten metal; emitting the gas from the distributor in the form of a plurality of bubble jets into contact with the molten metal at said zone, said bubble jets exerting a reaction force on the distributor; and agitating the molten metal to effect uniform dispersion of the gas emitted therein by whirling the bubble jets in the molten metal, said whirling being accomplished by rotating the distributor in response to said reaction forces. The apparatus comprises a supply conduit connected at one end to a source of pressurized gas and connected at the other end to a rotatable hollow sleeve immersed in the molten metal.