The compressor

Volumetric
compressors

widely used
piston-compressor

screw-compressor

other:
blade-compressor

rootscompressor

 

Compressors are used to make compressed air out of normal atmospheric air. Many types of compressors are known varying in their principles or construction.

The types of compressors can be sub-divided into dynamic and volumetric compressors.

The principle of dynamic compressors is moving of the gas being subject to kinetic energy which is being transformed into a pressure.

Volumetric compressors are a direct application of the law of Boyle-Marotte (p x V = p1 x V1 = constant) where a decrease of volume results in increase of pressure.