Compressed air is air kept under a pressure that is greater than atmospheric pressure. Compressed air is an important medium for the transfer of energy in industrial processes. Compressed air is used for power tools such as air hammers, drills, wrenches, and others. Compressed air is used to atomize paint, to operate air cylinders for automation, and can also be used to propel vehicles. Compressed air tends to contain high amounts of moisture which can lead to corrosion and malfunctions in the equipment that the compressed air runs through. In fact, if the equipment is outside in cold temperatures, the moisture in the compressed air can actually freeze, leading to burst lines and other issues. The refrigerated air dryers help remove moisture out of the compressed air so that the life of the equipment is extended.