Mechanical engineering studies the formulation, design, development, and control of systems and components involving solid mechanics, dynamics and controls, fluid mechanics, heat and mass transfer, manufacturing and the conversion of energy into useful work. Industries that use mechanical engineers are involved in robotics, computer aided design/manufacturing (CAD/CAM), automotive / transportation, air-conditioning and refrigeration, and machine-to-machine interaction or machine-to-human interaction. A career in mechanical engineering gives flexibility in future employment opportunities as well as tools the individual can use to design devices and products that benefit society.