Who invented the steam engine?

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Thomas Savery

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answer is A.

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Detailed Solution

The steam engine was invented by Thomas Savery.
To perform mechanical work, a steam engine requires steam as its working fluid. The pressure of the steam produces a force that the steam engine uses to move a piston back and forth inside a cylinder. This pushing force can be transformed into a rotational force for labour using a connecting rod and crank. Thomas Savery made the first commercially successful water pump in 1698. The water was lifted by employing a vacuum formed by condensing steam, followed by applying steam pressure to raise it even higher.

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