Mechanical engineering is the branch of engineering that deals with the tools, machines and mechanical equipment. They concern about design, development, production, installation and soon. Mechanical engineering is a border branch of engineering science that analyze the application of laws and principles of physics, involving the design, manufacture and maintenance of mechanical systems. A mechanical engineer knows the key concepts including mechanics, kinematics, thermodynamics and energy. He / she can in different areas, mechanical systems, including automobiles, aircraft, work, heating and cooling, manufacturing, industrial equipment and machinery, medical devices and more. Mechanical engineers also conduct research, develop, construct and test tools, engines, machines and other mechanical devices. They work on power-producing machines such as electric generators, combustion engines and steam and gas turbines and power-using machines such as refrigeration and air conditioning equipment, machine tools, conveyors, elevators and escalators, industrial production equipment and robots used in manufacturing. The Mechanical engineers can in production in manufacturing or agriculture, maintenance, or technical sales work, many are also absorbed as administrators or managers.