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How can an aneroid barometer give reading in inches of mercury when it doesn use any mercury?

April 26, 2017aneroid barometer inches mercury Reading

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How can an aneroid barometer give reading in inches of mercury when it doesn use any mercury?

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Then, as the pressure changed you marked the second barometer positions and noted on the dial the inches reading from the mercury barometer, the second barometer measurement scale would mimic the real mercury barometer even though it did not actually use any mercury.