270:
The value adopted in the
International Service of Weights and Measures for the standard acceleration due to Earth's gravity is 980.665 cm/s, value already stated in the laws of some countries.
259:. This task was given to Gilbert Étienne Defforges of the Geographic Service of the French Army. The value he found, based on measurements taken in March and April 1888, was 9.80991(5) m⋅s.
133:(without a suffix) can also mean the local acceleration due to local gravity and centrifugal acceleration, which varies depending on one's position on Earth (see
110:
from the rotation of the Earth (but the latter is small enough to be negligible for most purposes); the total (the apparent gravity) is about 0.5% greater at the
576:
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of 760 mm. But since that weight depends on the local gravity, they now also needed a standard gravity. The 1887 CIPM meeting decided as follows:
218:
17:
656:
M. Amalvict (2010). "Chapter 12. Absolute gravimetry at BIPM, Sèvres (France), at the time of Dr. Akihiko Sakuma". In
Stelios P. Mertikas (ed.).
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of 45°. Although the actual acceleration of free fall on Earth varies according to location, the above standard figure is always used for
263:
91:
181:
defined above is a nominal midrange value on Earth, originally based on the acceleration of a body in free fall at sea level at a
233:, the CIPM needed to define a standard atmospheric pressure. The definition they chose was based on the weight of a column of
665:
640:
255:
All that was needed to obtain a numerical value for standard gravity was now to measure the gravitational strength at the
283:
was, in accordance with the 1887 CIPM declaration, obtained by dividing
Defforges's result – 980.991 cm⋅s in the
559:
198:
521:
722:
591:
712:
251:) divided by 1.0003322, the theoretical coefficient required to convert to a latitude of 45° at sea level.
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This result formed the basis for determining the value still used today for standard gravity. The third
291:– by 1.0003322 while not taking more digits than warranted considering the uncertainty in the result.
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102:. The acceleration of a body near the surface of the Earth is due to the combined effects of
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is equal to the acceleration due to gravity at the
International Bureau (alongside the
134:
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is also used as a unit for any form of acceleration, with the value defined as above.
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From
Artefacts to Atoms: The BIPM and the Search for Ultimate Measurement Standards
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Gravity, Geoid and Earth
Observation: IAG Commission 2: Gravity Field
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266:, held in 1901, adopted a resolution declaring as follows:
154:
531:. p. 52. NIST special publication 330, 2008 edition.
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of an object as the product of its mass and this nominal
520:
Taylor, Barry N.; Thompson, Ambler, eds. (March 2008).
189:
purposes. In particular, since it is the ratio of the
201:
SI units is the ratio of the kilogram-force and the
90: ft/s). This value was established by the 3rd
229:of water. Since the boiling point varies with the
590:. Arlington, Texas: S.A.W.E., Inc. Archived from
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301:Conversions between common units of acceleration
219:International Committee for Weights and Measures
217:Already in the early days of its existence, the
529:National Institute of Standards and Technology
519:
94:(1901, CR 70) and used to define the standard
552:International Bureau of Weights and Measures
27:Standard gravitational acceleration on Earth
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264:General Conference on Weights and Measures
92:General Conference on Weights and Measures
617:, Cornell University, retrieved June 2007
127:is sometimes used for standard gravity,
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544:The International System of Units (SI)
522:The international system of units (SI)
221:(CIPM) proceeded to define a standard
197:, its numeric value when expressed in
244:standard acceleration due to gravity
682:"Resolution of the 3rd CGPM (1901)"
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36:standard acceleration of free fall
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32:standard acceleration of gravity
18:Standard acceleration of gravity
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274:The numeric value adopted for
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660:. Springer. pp. 84–85.
143:should not be confused with
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579:Precise Measurement of Mass
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615:"Curious About Astronomy?"
554:. 2006. pp. 142–143.
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62:gravitational acceleration
575:Boynton, Richard (2001).
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108:centrifugal acceleration
68:near the surface of the
633:Oxford University Press
153:, or g, the symbol for
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151:gravitational constant
38:, often called simply
723:Units of acceleration
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239:
627:Terry Quinn (2011).
257:International Bureau
249:Pavillon de Breteuil
231:atmospheric pressure
121:Although the symbol
713:Physical quantities
588:Sawe Paper No. 3147
501:Theoretical gravity
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74:defined by standard
72:. It is a constant
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241:The value of this
64:of an object in a
667:978-3-642-10634-7
642:978-0-19-530786-3
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137:). The symbol
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599:. Retrieved
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114:than at the
100:acceleration
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491:Gravity map
314:, or cm/s)
307:Base value
295:Conversions
707:Categories
601:2007-01-21
527:(Report).
507:References
166:See also:
728:Constants
691:July 19,
480:See also
289:en vogue
199:coherent
195:kilogram
193:and the
718:Gravity
459:32.1740
454:980.665
386:30.4800
382:1 ft/s
235:mercury
213:History
168:g-force
116:Equator
104:gravity
664:
639:
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413:1 m/s
205:, two
203:newton
157:. The
149:, the
96:weight
85:32.174
66:vacuum
595:(PDF)
584:(PDF)
548:(PDF)
525:(PDF)
464:9.806
435:0.101
422:3.280
404:0.031
396:0.304
369:1.019
356:0.032
112:poles
78:9.806
70:Earth
693:2015
686:BIPM
662:ISBN
637:ISBN
556:ISBN
406:0810
364:0.01
358:8084
319:ft/s
155:gram
106:and
30:The
437:972
417:100
398:800
326:m/s
312:Gal
285:cgs
76:as
51:or
34:or
709::
684:.
631:.
586:.
466:65
444:1
424:84
376:10
371:72
342:)
335:,
328:)
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209:.
118:.
87:05
80:65
695:.
670:.
645:.
604:.
581:"
577:"
564:.
472:1
449:0
446:g
430:1
391:1
374:×
351:1
340:0
337:g
331:(
324:(
317:(
310:(
280:0
277:ɡ
178:0
175:ɡ
160:ɡ
146:G
140:ɡ
130:ɡ
124:ɡ
57:n
54:ɡ
48:0
45:ɡ
20:)
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