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Medical Definition of pneumatics. : a branch of mechanics that deals with the mechanical properties of gases.
The principles of pneumatics are the same as those for hydraulics, but pneumatics transmits power using a gas instead of a liquid. Compressed air is usually used, but nitrogen or other inert gases can be used for special applications.With pneumatics, air is usually pumped into a receiver using a compressor.he principles of pneumatics are the same as those for hydraulics, but pneumatics transmits power using a gas instead of a liquid. Compressed air is usually used, but nitrogen or other inert gases can be used for special applications.