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mercury barometer

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mercury barometer [′mər·kyə·rē bə′räm·əd·ər]
(engineering)
An instrument which determines atmospheric pressure by measuring the height of a column of mercury which the atmosphere will support; the mercury is in a glass tube closed at one end and placed, open end down, in a well of mercury. Also known as Torricellian barometer.


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A classic mercury barometer is a glass tube nearly three feet high packed with mercury.
For instrument systems that vary with pressure, record barometric pressure readings from the point-of-care instrument and from a mercury barometer installed in the same room.
 
 
 
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