What is steam engine ??
explain !!! ​

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 is transformed, by a connecting rod and flywheel, into rotational force for work.

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engine that uses the expansion or rapid condensation of Steam to generate power

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i'm assuming that it's c.) red bank..