There are many reasons why you need to buy 12v air compressor for your car. They include but not limited to increasing air compression, air flow, decreasing static pressure, increasing cooling and dehumidification. An air compressor increases air compression and air flow, which consequently, lower the static pressure inside the cylinder of the compressor. This allows more air to fill the cylinder than what is required to complete the task. You will find them being used in a wide variety of circumstances, like powering air tools for construction or automotive work. Best 12v air compressor Maximum Air Pressure: This refers to the maximum amount of air that can be compressed in one go. It is generally represented in terms of PSI (pounds per pound per minute). For a 12v air compressor it is good enough to manage the jobs with little pressure build up. Maximum air pressure also depends on the type of tires you have, so it is always best to consult an expert or consult the manual that came with your vehicle before you purchase anything. It really depends on what is ….