Air compressors and vacuum pumps are very similar devices and often perform the same tasks. The main difference between the two is the operation of the air compressor and the vacuum pump. Both these have different efficiencies. However, the significant difference between vacuum pumps and air compressors are given below. 1. Vacuum Strength: The strength of a vacuum pump measures by using the absolute outlet pressure. The lower the number, the higher the pump output. On the other hand, compressor strength is measured by its capability to create high compression demands on the fluid. 2. Capacity: Air compressors use to store compressed air, so various models have various volumes. On the other hand, vacuum pumps do not require any storage capacity, as they only transfer gases and liquids from one place to another. 3. Power Consumption: Vacuum pumps generally use less energy compared to air compressors. It means that vacuum pumps can be considered more effective. But, any type of pump or compressor is suitable for various applications and depends on the pump or compressor's use. 4. Flow Rate: The vacuum pump flow rate varies according to the pressure through the pump. In comparison, the flow rate of an air compressor varies on its ability to reduce volume.