MERCURIAL BAROMETER
An instrument used for measuring the change in atmospheric pressure. It uses a long glass tube, open at one end and closed at the other.
mercurial barometer—A barometer in which pressure is determined by balancing air pressure against the weight of a column of mercury in an evacuated glass tube.
11. Picture of a "Mercurial Barometer" I constructed.
12. Picture of amateur weather station I constructed while in junior and senior high school in Dunmore, Pa. USA.
The weather station was located in my parents back yard.
Section "W" ...
Mercurial barometer Same as mercury barometer. Mercury A metallic element of atomic weight 200.61, unique (for metals) in that it remains liquid under all but very extreme temperatures.
mercury barometer"(Or mercurial barometer; formerly called Torricelli's tube.) A glass manometer, employing mercury in its vertical column, that is used to measure atmospheric pressure.
INCHES OF MERCURY (Hg) The name comes from the use of mercurial barometers which equate the height of a column of mercury with air pressure. One inch of mercury is equivalent to 33.86 millibars or 25.40 millimeters.
BAROMETER An instrument used to measure atmospheric pressure. Two examples are the aneroid barometer and the mercurial barometer.
The aneroid is a thin-walled metal capsule or cell, usually made of phosphor bronze or beryllium copper. The scales on the glass cover measure pressure in both inches and millibars. Related term: mercurial barometer ...
The name comes from the use of mercurial barometers which equate the height of a column of mercury with air pressure. One inch of mercury is equivalent to 33.86 millibars or 25.40 millimeters. See barometric pressure.
 See also: Weather, Barometer, Temperature, Pressure, Surface
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