A nebulizer comprises an upright, cylindrical, tower-like chamber mounted on the lid of a liquid storage bottle and a vortex-generating transducer. The chamber has a closed upper end and an open lower end directed to the bottle. The transducer is mounted on the closed end with its outlet opening into the chamber. Windows are formed in the side of the chamber adjacent the outlet of the transducer. A nebulizer comprises a T-shaped chamber secured to the inside of a closed liquid storage bottle and a vortex-generating transducer. The chamber has inline legs with open ends and a transverse leg with a closed end. One open end faces downwardly into the bottle, the other open end is connected by an elbow to a spout leaving the bottle. The transducer is mounted on the closed end with its outlet facing into the chamber and its axis is pointed down at a small acute angle to the axis of the transverse leg.