
Fluidics, or fluidic logic, is the use of a fluid to perform analog or digital operations similar to those performed with electronics. The physical basis of fluidics is pneumatics and hydraulics, based on the theoretical foundation of fluid dynamics. The term fluidics is normally used when devices have no moving parts, so ordinary hydraulic compon...
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http://en.wikipedia.org/wiki/Fluidics

the technology of using the flow characteristics of liquid or gas to operate a control system (q.v.). One of the newest of the control technologies, ...
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http://www.britannica.com/eb/a-z/f/40

the technology dealing with the use of a flowing liquid or gas in various devices, esp. controls, to perform functions usually performed by an electric current in electronic devices. Also called
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https://www.infoplease.com/dictionary/fluidics
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