Basically, compressor is mechanical device that increase the pressure of a gas by reducing its volume. An air compressor is a type of gas compressor.
An air compressor increases the air or gas pressure at least 3 time higher than that of atmospheric pressure so the compression ratio for compressor is more than 3.
The tern compression is use for measure parameter define by total outlet pressure divided by total inlet pressure of the system. This tern is used for comparing the pumping and pressurization for compressor.
Compressors is also used for transfer gas or air from one place to another place with increase pressure, reduce volume.
Compressor are used for many purposes like home applications like fridges, Air condition, automobiles shop, industrial application and other.
Working principle of compressor is same as pump but pump is use for transfer liquid with increase pressure. Now day it is use for utility purposes for industries.