The nozzle is a key portion of the journey to explore the wonders of pneumatics. The nozzle is attached to the tube which is attached to the pump. While the pump generates the pneumatic flow, the tube transports the energy and the nozzle releases the power onto the desired object. Depending on the shape and size of the nozzle, different force can be exerted on the entity.
Converging nozzles use a chokepoint to converge (go figure) the gas and funnel it through a small area before expanding and exiting the nozzle. With this chokepoint, it takes more force to push the air out of the compression, therefore yielding a stronger output from the nozzle. This nozzle directs and focuses the flow of gas onto the desired object and applies the most pneumatic strength.
Diverging nozzles are in the shape of a cone and spread out the gas flowing through it to apply pressure to all surfaces of the object that will be moved. This type of nozzle is better than the converging nozzle by covering more surface area, but does not have the focused strength of air being propelled through a converging nozzle.
Source: http://www.engapplets.vt.edu/fluids/CDnozzle/cdinfo.html
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