Engine (nonfiction)
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An engine or motor is a machine (nonfiction) designed to convert one form of energy into mechanical energy.
Description
Heat engines, including internal combustion engines and external combustion engines (such as steam engines), burn a fuel to create heat, which then creates a force.
Electric motors convert electrical energy into mechanical motion
Pneumatic motors use compressed air
Clockwork motors in wind-up toys—use elastic energy.
In biological systems, molecular motors, like myosins in muscles, use chemical energy to create forces and eventually motion.