Pneumatic systems make use of canisters of compressed air or specialized gasses to then exert a force on a wide array of pistons and machine parts. These pistons and components then provide the necessary movement required by the machine to accomplish its given task. While the possibilities are vast when it comes to operating any type of system, Pneumatic systems are one of the simplest methods - which in turn makes them one of the most prevalent as well. Source:lidaqd.com
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http://www.lidaqd.com/news/Pneumatic-Systems-A-Simplest-Methods.htm
