Evaporation powered Engine

“Sahin and colleagues created what they’re calling “hygroscopy driven artificial muscles,” or HYDRAs, using bacterial spores that shrink and swell as the humidity changes. Within the spores, water is confined in tiny cavities, and humidity triggers pressure changes. Using HYDRAs, the team created two kinds of devices—a floating, piston-driven engine and a rotary engine—that can help generate electricity from evaporation.”

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