Pneumatics
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Pneumatics is the use of gas or pressurized air to create mechanical motion in mechanical systems.
Pneumatic (compressed-air) fireless locomotives like this were often used to haul trains in mines, where steam engines posed a risk of explosion. This one is preserved H.K. Porter, Inc. No. 3290 of 1923.
A pneumatic butterfly valve
Compressed air
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Compressed air is air kept under a pressure that is greater than atmospheric pressure. Compressed air in vehicle tires and shock absorbers are commonly used for improved traction and reduced vibration
Pneumatics
…Pneumatics (from Greek πνεῦμα pneuma 'wind, breath') is the use of gas or pressurized air to create mechanical motion in mechanical systems. Pneumatic systems used in industry are commonly powered by compressed air or compressed inert gases…
Technical illustration of portable single-stage air compressor
Diving cylinders used to store compressed air or other breathing gasses for underwater diving
Air compressor station in a power plant
Two-stage air compressor assembled on a horizontal tank and equipped with a Joule-Thomson (JT) type refrigerated compressed air dryer