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Barometer
 and the aneroid barometer (right). In the mercury barometer, the weight of the column of mercury is balanced by the pressure of the atmosphere on the lower end. A change in height of the column indicates a change in atmospheric pressure. In the aneroid barometer, any change of atmospheric pressure causes the metal box which contains the vacuum to be squeezed or to expand slightly. The movements of the box sides are transferred to a pointer and scale via a chain of levers.', copy:'(Image © RM)'});)
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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. In an aneroid barometer, a shallow cylindrical metal box containing a partial vacuum expands or contracts in response to changes in pressure.
© Research Machines plc 2008. All rights reserved. Helicon Publishing is a division of Research Machines plc.
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air mass
anemometer
anticyclone
atmosphere (earth science)
atmospheric pressure
barometer
climate
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climatic region
cloud
continental climate
cyclone
depression (meteorology)
El Niño
global warming
greenhouse effect
hurricane
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meteorology
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precipitation (meteorology)
prevailing wind
rain
sunshine recorder
thermometer
weather
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air mass
anemometer
anticyclone
atmosphere (earth science)
atmospheric pressure
barometer
climate
climate classification
climatic region
cloud
continental climate
cyclone
depression (meteorology)
El Niño
global warming
greenhouse effect
hurricane
Mediterranean climate
meteorology
ocean current
precipitation (meteorology)
prevailing wind
rain
sunshine recorder
thermometer
weather
weather forecast
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