Abstract: A method and apparatus for producing uniform heating and cooling using an electrically and, thermally conductive liquid or ionized gas as a heat transfer medium. The fluid is enclosed within a chamber defined by a top plate, a bottom plate, and a surrounding rim. Azimuthal motion is imparted to the fluid by passing a current between an electrode which is centrally positioned in the bottom plate and a continuous ring electrode which is positioned circumferentially around the bottom plate. Rolling motion, which causes the fluid to shear over the top and bottom plates, is imparted to the fluid by sequentially passing a current between a plurality of opposing electrode pairs positioned circumferentially around the upper plate in the presence of an axially aligned magnetic field produced by a magnet positioned beneath the lower plate.