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- DictionarySteam en·gine/ˈstēm ˌenjən/
noun
- 1. an engine that uses the expansion or rapid condensation of steam to generate power.
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noun
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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 crank, into rotational force for work. Wikipedia