Many of the early steam engines,called ____ engines,operated on the principle of creating a vacuum by condensation.

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The phrase "creating a vacuum by condensation" refers to the atmospheric engines, which used steam to create a vacuum in a cylinder, causing a piston to move and do work. Liquid and compressor engines do not operate on this principle, and "cloud engines" is not a common term in steam engine history.

Many of the Early Steam Engines,called ____ Engines,operated on the Principle