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Date: Jun 04, 2007 - 05:00 PM
Here's an odd way to generate electricity: convert waste heat into sound.

Using sound to convert heat into electricity has two key steps. Symko and colleagues developed various new heat engines (technically called "thermoacoustic prime movers") to accomplish the first step: convert heat into sound.

Then they convert the sound into electricity using existing technology: "piezoelectric" devices that are squeezed in response to pressure, including sound waves, and change that pressure into electrical current. "Piezo" means pressure or squeezing.
Coming soon: electricity from your hot tub.

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