write five lines about invention of steam engine
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A steam engine is a heat engine that performs mechanical work using steam as its working fluid.
The steam engine uses the force produced by steam pressure to push a piston back and forth inside a cylinder.
This pushing force can be transformed, by a connecting rod and flywheel, into rotational force for work.
The term "steam engine" is generally applied only to reciprocating engines as just described, not to the steam turbine.
Steam engines are external combustion engines, where the working fluid is separated from the combustion products.
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