We explored the science of pneumatics and hydraulics. There is tremendous energy both in moving air and in moving water. Trapped air and water can also produce great forces. Air brakes on buses and trucks, and drills for breaking up roads, are examples of pneumatics. Hydraulics (using trapped liquids) are used in many heavy machines because of their huge strength, e.g. bulldozers, forklifts, hydraulic brakes. In rang a 5 we explored this trapped air and water and investigated the forces that they can produce.