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mercury barometer

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mercury barometer

–noun
a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.
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Based on the Random House Dictionary, © Random House, Inc. 2009.
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mercury barometer

noun
barometer that shows pressure by the height of a column of mercury 
WordNet® 3.0, © 2006 by Princeton University.
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