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Meter in and meter out circuits are not in pneumatics as air is compressible.Hence uniform control of actuators are not possible
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Can only assume the question was "why do you use compressors for pneumatics?"...But if not, ignore this. If you didn't use a compressor, your circuit wouldn't do anything, the air would but incapable of pushing the cylinders, opening valves or doing anything.
You measure it with an aneroid gauge.
Pneumatics have the advantage over Hydraulics in that they are clean, require lower maintenance and respond quicker. When the application does not require that much force, pneumatics will do the job. Furthermore: the force needed for train doors should not be that large. It should only open and close the doors but not crush people that manage to get stuck in between
They are gases, usually air.
pneumatics
pneumatics
In a nutshell, pneumatics is a means whereby signals and energy are transmitted, controlled and distributed using pressurized air as the medium. Pneumatics can be effectively combined with other technologies through the use of sensors, transducers and microprocessors
One uses a liquid, one uses air. not the same
oil is slightly compressible 0.5 % at 70 bar. but air is compressible. so to get the required pressure pneumatics require more energy source than hydraulics also there are some limitations for pneumatics in terms of force.
the branch of physics that deals with the mechanical properties of air and other gases.
Speed​​. Rapid transfer of power. Cheap air. The system is simple.
My thoughts go like this...(from watching 'Scrapheap Challenge"0 plus a little basic knowledge of physics. 1/ Pneumatics involve the movement of pistons and what not via the medium of compressed air or air under pressure. 2/ Hydraulics involve the movement of pistons and what not via the medium of compressed fluids or fluid under pressure. 3/ Fluid is denser than gas (compressed air). I believe hydraulics can handle far heavier loads than pneumatics. Pneumatics would appear to use a lighter more flexible medium than hydraulics. In answer to your question, I believe hydraulics would be far more effective at manipulating heavy loads versus pneumatics. However, pneumatics would be a more flexible system than hydraulics. Hows that?
Some actuator or devices are operated by compressed air. These devices are known as pneumatic components
Pneumatic has a carbide industry. Many things can be done with air pressure and a remote control.
It's the same thing as a hollow bone. That's one of the characteristics birds posse than enables them to fly (if their bones had the same weight as ours, they wouldn't be able to lift). Some dinosaurs had the same type of bones. Hope it helped.