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engine
A device for converting stored energy into useful work. Most engines in use today are heat engines which convert heat into work, though the efficiency of this process, being governed according to the second law of thermodynamics is often very low. Heat engines are commonly classified according to the fuel they use (as in gasoline engine), by whether they burn their fuel internally or externally, or by their mode of action (whether they are reciprocating, rotary, or reactive).
Related category
• CLASSICAL MECHANICS
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Encyclopedia of Alternative Energy & Sustainable Living
Encyclopedia of History
Transport Concepts & Designs (partner site)