Abstract: A nozzle for atomizing or discharging a liquid, particles, powder or the like in a uniform and stable state without disturbance, utilizing a rotating air current of low wind pressure, low velocity and low flow rate. A working fluid, for example air, is fed through a passage of a nozzle body, flows in a laminar state around a working fluid straightening member, and then passes through tornado-stage fluid slots and is discharged in a tornado shape vortex at the nozzle outlet. A vacuum is produced when the working fluid is discharged from the nozzle outlet, and a fluid to be atomized is drawn through a passage in the straightening member by this vacuum and is atomized together with the working fluid in a tornado shape at the nozzle outlet. The nozzle bore can be larger than in conventional nozzles.