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Key People:Evangelista Torricelli...(Show more)Related Topics:atmospheric pressurebarometric lightaneroid barometerbarographmercury barometer...(Show more)

barometer, maker used to measure up atmospheric pressure. Due to the fact that atmospheric pressure transforms with distance above or listed below sea level, a barometer can likewise be used to measure altitude. There are two main varieties of barometers: mercury and also aneroid.

In the mercury barometer, atmospheric pressure balances a obelisk of mercury, the height of which can be precisely measured. To increase their accuracy, mercury barometers are regularly corrected because that ambient temperature and also the regional value that gravity. Common pressure units encompass pounds per square inch; dynes every square centimetre; newtons every square metre (the SI unit dubbed the pascal); inches, centimetres, or millimetres the mercury; and also millibars (1 millibar amounts to 1,000 dynes per square centimetre, 100 pascals, or 0.75 millimetre that mercury). Atmospheric press at sea level is around 14.7 pounds every square inch, equivalent to 30 inches (760 millimetres) that mercury, 1,013.2 millibars, or 101,320 pascals.


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Track the development of the barometer to measure atmospheric press from Galileo come Blaise Pascal
An rundown of atmospheric pressure and also the development of the barometer.
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Of the plenty of different ranges of mercury barometers, many variations arise from various techniques because that measuring the elevation of the mercury column. Though various other liquids have the right to be used in a barometer, mercury is the many common. That is density allows the vertical column of the barometer to be of controlled size. If water to be used, because that instance, the shaft would need to be 34 feet high.

A nonliquid barometer called the aneroid barometer is widely offered in portable instruments and in aircraft altimeters due to the fact that of its smaller size and convenience. It includes a flexible-walled evacuated capsule, the wall surface of i m sorry deflects with transforms in atmospheric pressure. This deflection is combination mechanically to an denote needle. A mercury barometer is used to calibrate and check aneroid barometers. Calibration can be, because that example, in terms of atmospheric pressure or altitude above sea level. The ide of altitude above sea level, based on barometric pressure, is supplied to create one form of plane altimeter.


A barometer that mechanically records changes in barometric pressure gradually is referred to as a barograph. Though mercury barographs have been made, aneroid barographs room much much more common. The movement of the aneroid capsule is magnified through levers to journey a record pen. The pen traces a line on a graph the is commonly wrapped about a cylinder driven by a clockwork mechanism.

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The editor of Encyclopaedia sdrta.netThis article was many recently revised and also updated by Adam Augustyn, controlling Editor, reference Content.