Abstract: Ozone is produced when oxygen dissolved or absorbed in an inert liquid dielectric is irradiated with ultra violet (light) energy in the wave length range between 1100 and 2200 angstrom units. The apparatus wherein oxygen gas or air or mixtures thereof, converts a percentage of the oxygen to ozone is composed of special ultra violet 1100 to 2200 angstrom wave length transmitting glass or plastic liquid retainer structural material for the selected inert dielectric liquid used as the absorber liquid for the oxygen, air and ozone gases. The configurations for construction of the apparatus are adinfinitum as flat parallel sheets, paired-corrugated sheets, concentric tubes, etc., any of which control the thickness of the dielectric liquid passing by the source of irradiation.