Barometric corrections: Difference between revisions

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|Meaning=The corrections that must be applied to the reading of a [[mercury barometer]]  in order that this observed value may be rendered accurate.
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|Explanation=There are four kinds. 1) The [[instrument correction]] is the mean difference between the readings  of a given mercury barometer and those of a [[standard]] instrument. It is a composite [[correction]],  including the effects of [[capillarity]] (<br/>''see'' [[capillarity correction]]), [[index]] misalignment, imperfect  vacuum, and [[scale]] correction, which are the [[barometric errors]]. 2) The [[temperature correction]]  is applied to account for the difference between the [[coefficient of expansion]] of [[mercury]] and  that of the scale. 3) The [[gravity correction]] is necessary because the [[acceleration of gravity]] varies  with both [[altitude]] and [[latitude]]. 4) The [[removal correction]] is applied when the [[barometer elevation|barometer  elevation]] differs from the adopted [[station elevation]] and/or [[climatological station]] elevation. <br/>''See  also'' [[capacity correction]].<br/> U.S. Weather Bureau 1941. Barometers and the Measurement of Atmospheric Pressure. Circular F, 7th ed., rev.  
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== barometric corrections ==
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<div class="definition"><div class="short_definition">The corrections that must be applied to the reading of a [[mercury barometer]]  in order that this observed value may be rendered accurate.</div><br/> <div class="paragraph">There are four kinds. 1) The [[instrument correction]] is the mean difference between the readings  of a given mercury barometer and those of a [[standard]] instrument. It is a composite [[correction]],  including the effects of [[capillarity]] (<br/>''see'' [[capillarity correction]]), [[index]] misalignment, imperfect  vacuum, and [[scale]] correction, which are the [[barometric errors]]. 2) The [[temperature correction]]  is applied to account for the difference between the [[coefficient of expansion]] of [[mercury]] and  that of the scale. 3) The [[gravity correction]] is necessary because the [[acceleration of gravity]] varies  with both [[altitude]] and [[latitude]]. 4) The [[removal correction]] is applied when the [[barometer elevation|barometer  elevation]] differs from the adopted [[station elevation]] and/or [[climatological station]] elevation. <br/>''See  also'' [[capacity correction]].</div><br/> </div><div class="reference">U.S. Weather Bureau 1941. Barometers and the Measurement of Atmospheric Pressure. Circular F, 7th ed., rev. </div><br/>
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Latest revision as of 21:56, 13 January 2024

The corrections that must be applied to the reading of a mercury barometer in order that this observed value may be rendered accurate.

There are four kinds. 1) The instrument correction is the mean difference between the readings of a given mercury barometer and those of a standard instrument. It is a composite correction, including the effects of capillarity (
see capillarity correction), index misalignment, imperfect vacuum, and scale correction, which are the barometric errors. 2) The temperature correction is applied to account for the difference between the coefficient of expansion of mercury and that of the scale. 3) The gravity correction is necessary because the acceleration of gravity varies with both altitude and latitude. 4) The removal correction is applied when the barometer elevation differs from the adopted station elevation and/or climatological station elevation.
See also capacity correction.
U.S. Weather Bureau 1941. Barometers and the Measurement of Atmospheric Pressure. Circular F, 7th ed., rev.


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