Mechanical engineering is concerned with energy, manufacturing, and design of machines. Design, which involves analyzing needs and designing products and systems, including complex human-machine systems, to fill them is key to mechanical engineering.Mechanical engineers use energy principles and mechanics to design a wide variety of devices, machines, and systems, including complex human-machine systems, for energy conversion, biofuel production, environmental control, materials processing, transportation, materials handling, and other purposes. They may develop robots for space exploration, use a computer to simulate the freezing of human cells, or improve devices for use of alternative energy sources, such as fuel cells, wind turbines, and solar energy converters.

Mechanical engineering is concerned with energy, manufacturing, and design of machines. Design, which involves analyzing needs and designing products and systems, including complex human-machine systems, to fill them is key to mechanical engineering.Mechanical engineers use energy principles and mechanics to design a wide variety of devices, machines, and systems, including complex human-machine systems, for energy conversion, biofuel production, environmental control, materials processing, transportation, materials handling, and other purposes. They may develop robots for space exploration, use a computer to simulate the freezing of human cells, or improve devices for use of alternative energy sources, such as fuel cells, wind turbines, and solar energy converters.