A team of German physicists has just created the world's smallest working engine. Powered by a single electrically-charged calcium atom, the new device is claimed to have the equivalent thermodynamic efficiency (if scaled to size) of an average automobile engine. Basically a heat-exchange engine, its single-atom acts as both fuel and powerplant and is heated by electrical noise and cooled by laser beam... Continue Reading World's smallest engine powered by a single atom
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