The general subject of instruments and controls dependent upon low rate flow of air or gas at low pressure as the operating medium. These usually have no moving parts. ( 0301)

Technological application of fluids to perform functions, such as controlling mechanisms using hydraulic pressure and flow. Fluid Mechanics Science governing the behavior of fluids.

Fluidics (also known as Fluidic logic) is the use of a fluid or compressible medium to perform analog or digital operations similar to those performed with electronics.