Basically pneumatics deal with lower loadings, hydraulics offer a better power
to space ratio, useful in say aircraft design.
it compresses and expands gas so i would say pneumatics but not in the normal sense
Each one has its advantages and disadvantages so it depends on what you wish to achieve.
Speed​​. Rapid transfer of power. Cheap air. The system is simple.
Pneumatics is the use of pressurized gas to affect mechanical motion.
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
you dont
people
In an Automobile Pneumatics is used in tyres, breaks, suspension speed control and time delay
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
it isn't
the compressibility of gas
pneumatics