Most simply, air compressors work by doing exactly what it sounds like they do – they make use of air pressure to get the job done. First, they compress air it into a smaller volume from what it originally was. Onc.
[pdf] Rotary screw air compressors work by trapping air between two meshed rotors and reducing the volume of that trapped air as it moves down through the rotors. This decrease in volume results in compressed a.
[pdf] These electric air compressors permanently mount to the bed of a service truck for ready access to compressed air for tire inflation or for powering air tools. They are powered by a DC battery for low-noise and exhaust-free operation.
[pdf] 
