suitable liquid from the source flows through the inlet port 12 and because it is at sufficient pressure enters the switching chamber 10 as a jet because air can be entrained through the expansion chamber 39 s orifice 28 to satisfy the jet 39 s entrainment requirement on its left side the jet initially tries to attach to the chamber 39 s right wall where a coanda bubble is seen to form thereby producing a lower pressure area on the jet 39 s right side see fig1 a where water is entering the fluidic 1 and the container 20 contains air the pressurization of the container continues until in fig1 b the flow stops in the right leg and the right hand coanda bubble is increased in pressure then when the pressure differential across the jet is reversed so that the left side pressure is lower than the right the jet switches to the left side of the chamber see fig1 c with such a speed and intensity as to create a pressure wave in the fluidic 39 s exhaust passage and expansion chamber this pressure wave causes the output water flow to issue a rapid top hat profiled jet see fig1 d that subsequently expands into various liquid spray shapes depending on the values of the geometric variables of l and d of the fluidic 39 s expansion chamber the reflecting pressure spike switches the power jet back to the contained port and the process is repeated resulting in a series of unique free liquid into gas jet shapes being exhausted from the expansion chamber 39 s.