The mechanical engineer has been called the general practitioner and the jack-of-all trades among engineering professions. This is because he requires education and skills that span a broad range of technical, social, environmental, and economic problems. In general, however, the mechanical engineer is concerned with controlling the principles of motion, energy, and force through mechanical solutions.
A mechanical engineer designs the tools and processes used for satisfying the needs of society through a combination of material, human, and economic resources. She might work on electric generators, internal combustion engines, steam and gas turbines, and other power-generating machines. She might also develop machines such as refrigeration and air-conditioning equipment, power tools, and other power-using machines.