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This article is about the tool. For information of the religious concept please see Pneumatic (Gnosticism) . Pneumatics (from the Greek πνευματικός ''pneumatikos'', coming from the wind) is the use of '''pressurized gas''' to do Work in Science and Technology . Pneumatics was first documented by Hero Of Alexandria in 60 A.D., though the subject had been known before then. APPLICATION Pneumatics is employed in a variety of settings. In Dentistry applications, pneumatic drills are lighter, faster, and simpler than an electric Drill of the same power rating (because the prime mover, the Compressor , is separate from the drill and pumped air is capable of rotating the drill bit at extremely high rpm). Pneumatic transfer systems are employed in many industries to move powders and devices. Pneumatic Tube s can carry objects over distances. Pneumatic devices are also used where Electric Motor s cannot be used for Safety reasons, such as deep in a mine where explosive dust or Gases may be present. Examples of Pneumatic Tool s:
electricity
COMPARISON TO HYDRAULICS Both pneumatics and hydraulics are applications of Fluid Power . Pneumatics uses air, which is compressible, while Hydraulics uses relatively incompressible liquid media such as oil or water. Most industrial pneumatic applications use pressures of about 80 to 100 pounds per square inch (psi) (500 to 700 Kilopascal s). Hydraulics applications commonly use from 1,000 to 5,000 psi (7 to 35 MPa), but specialized applications may exceed 10,000 psi (70 MPa). Advantages of pneumatics
Advantages of hydraulics
PNEUMATIC COMPONENTS ]] Common industrial pneumatic components include:
PNEUMATIC LOGIC See Main article Fluidics Pneumatic logic systems are often used to control industrial processes, consisting of primary logic units such as: Pneumatic logic is a reliable and functional control method for industrial processes. In recent years, these systems have largely been replaced by electrical control systems, due to the smaller size and lower cost of electrical components. Pneumatic devices are still used in processes where compressed air is the only energy source available or upgrade cost, safety, and other considerations outweigh the advantage of modern digital control. EXTERNAL LINKS
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