The air vortex cannon, sold commercially as the air bazooka or airzooka is a short, wide plastic tube with a slight taper and a plastic diaphragm at the larger end. The diaphragm is attached to elastic strips which allow it to be extended and released with a sudden rush forcing a quantity of air out of the smaller end at speed. The design facilitates the formation of an air vortex which travels some distance and retains its energy sufficiently to cause a noticeable disturbance when it strikes a person or object.
Demonstration of the Bernoulli Principle.
