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Mechanical engineering is the study, design, development, construction, and testing of mechanical and thermal sensors and devices, including tools, engines, and machines. ... Mechanical engineers work mostly in engineering services, research and development, and manufacturing.Mechanical engineering is the study, design, development, construction, and testing of mechanical and thermal sensors and devices, including tools, engines, and machines. ... Mechanical engineers work mostly in engineering services, research and development, and manufacturing.Mechanical engineering is the study, design, development, construction, and testing of mechanical and thermal sensors and devices, including tools, engines, and machines. ... Mechanical engineers work mostly in engineering services, research and development, and manufacturing.