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 VIDEOS

Measuring Gas Temperature with Sound

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      Sounding Out a New Way to Measure Gas Flow
      
            In a new method for measuring gas flow, NIST researchers tracked the changing temperature of a gas using sound waves. A speaker placed at one end of a gas-filled chamber sends sound waves through the gas to form a standing wave, or resonant, wave, detected by the microphone. As gas exits the vessel, the remaining gas cools down, which is detected by a shift in the resonance frequency of the sound waves. Credit: S. Kelley/NIST

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