NOVELTY - An alcohol is mixed with oils or fats in presence of catalyst to form fluidic medium. Fluidic medium is introduced to static reaction chamber having passageway. Fluidic medium having initial fluid pressure is passed through sequential compartments in passageway. The fluid pressure of fluidic medium is reduced. Cavitational fluid features are generated in fluidic medium. Fluidic medium is restored to initial pressure to eliminate cavitational fluid features. Methyl- or ethyl-esters are separated from glycerin in fluidic medium created during transesterification.    USE - Production of methyl- or ethyl-ester of oil or fat used for producing biodiesel fuel.    ADVANTAGE - Methyl- or ethyl-ester is safely and efficiently produced without requiring high input energy.    DETAILED DESCRIPTION - An alcohol is mixed with oils or fats in the presence of a catalyst to form a fluidic medium. The fluidic medium is introduced to a static reaction chamber having a passageway. The fluidic medium having initial fluid pressure is passed through sequential compartments in the passageway. The compartments have varying diameters and inner surface features such that the fluidic medium undergoes localized reductions in fluid pressure. The fluid pressure of the fluidic medium is reduced such that phasic liquid/vapor pressure threshold is attained. Cavitational fluid features including bubbles and localized elevations of temperature and pressure are generated in the fluidic medium. The fluidic medium is restored to the initial fluid pressure to eliminate the cavitational fluid features. Methyl- or ethyl-esters are separated from glycerin in the fluidic medium created during the transesterification reaction. An INDEPENDENT CLAIM is included for apparatus for producing methyl- or ethyl-esters of oils or fats through transesterification reaction. The apparatus has static reaction chamber having passageway from inlet to outlet. Sequential compartments in the passageway moves from an inlet compartment adjacent the inlet to an outlet compartment adjacent the outlet. The outlet compartment has diameter equal to that of inlet.    DESCRIPTION OF DRAWING(S) - The drawing shows the perspective view of nano-cavitation generator.    Nano-cavitation generator (10)    Housing (12)    Inlet (16)    Outlet fitting (26)    Pressure gauge (36)