Nozzles
![Nozzles Nozzles](http://3dprintingaustralia.net/image/cache/catalog/3D Printer Parts/nozzles-260x260.jpg)
A nozzle is often a pipe or tube of varying cross sectional area, and it can be used to direct or modify the flow of a fluid (liquid or gas). Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them. In a nozzle, the velocity of fluid increases at the expense of its pressure energy.
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