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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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B
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Barometer
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1992-09-03
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574b
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15 lines
Instrument that measures atmospheric
pressure as an indication of weather.
Most often used are the mercury barometer
and the aneroid barometer. In a mercury
barometer a column of mercury in a glass
tube roughly 0.75 m/2.5 ft high (closed
at one end, curved upwards at the other) is
balanced by the pressure of the atmosphere on
the open end; any change in the height of the
column reflects a change in pressure. An
aneroid barometer achieves a similar result
by changes in the distance between the faces
of a shallow cylindrical metal box which is
partly exhausted of air.