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Medical Definition of pneumatics. : a branch of mechanics that deals with the mechanical properties of gases.
Hydraulics (from Greek: Î¥Î´ÏÎ±ÏÎ»Î¹ÎºÎ®) is a technology and applied science using engineering, chemistry, and other sciences involving the mechanical properties and use of liquids. At a very basic level, hydraulics is the liquid counterpart of pneumatics, which concerns gases.