All sorts of fluids are used everyday to perform mechanical operations. Examples of this are raising of a dump truck bucket and the air brakes on that same truck. The difference between the two is the state of the fluid being used to perform these mechanical tasks. Hydraulic operations are those that use a fluid in liquid state. Pneumatic operations are the ones that use a fluid in gas phase. Engineers from CATERPILLAR, working on the next generation construction machine aren't the only ones that can use The Hydraulic & Pneumatic Cortex to find suppliers. You can too.