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Leo Stannard x Frances - Gravity
Leo Stannard x Frances - Gravity
Published: 2017/04/18
Channel: IndieAir
Leo Stannard x Frances - Gravity (Luca Schreiner Remix) [Cover Art]
Leo Stannard x Frances - Gravity (Luca Schreiner Remix) [Cover Art]
Published: 2017/04/14
Channel: Ultra Music
(Sungha Jung)Gravity - MuMu guitar cover-牧-( Standard Tuning )
(Sungha Jung)Gravity - MuMu guitar cover-牧-( Standard Tuning )
Published: 2015/02/05
Channel: Qnbear&MuMu music
Leo Stannard - Gravity (Official Video) ft. Frances
Leo Stannard - Gravity (Official Video) ft. Frances
Published: 2017/06/06
Channel: LeoStannardVEVO
The Onion Reviews
The Onion Reviews 'Gravity'
Published: 2013/10/03
Channel: The Onion
Particle Physics Gravity and the Standard Model
Particle Physics Gravity and the Standard Model
Published: 2011/08/30
Channel: UCTVSeminars
Leo Stannard, Frances - Gravity (Audio)
Leo Stannard, Frances - Gravity (Audio)
Published: 2017/04/13
Channel: LeoStannardVEVO
"GRAVITY" COVER BY VINCE HARDER & STAN WALKER (JOHN MAYER)
"GRAVITY" COVER BY VINCE HARDER & STAN WALKER (JOHN MAYER)
Published: 2016/04/11
Channel: Vince Harder
Gravity falls journal 3 unboxing part 1
Gravity falls journal 3 unboxing part 1
Published: 2016/07/26
Channel: Silver Son
ZBR Fest Show #2 - 13 - THE WORLD THAT SUMMER - The Standard Gravity of Impending Doom
ZBR Fest Show #2 - 13 - THE WORLD THAT SUMMER - The Standard Gravity of Impending Doom
Published: 2017/08/09
Channel: David Norman
"Standard Gravity" - OpenKinect (libfreenect/python)
"Standard Gravity" - OpenKinect (libfreenect/python)
Published: 2010/11/21
Channel: Eric Gradman
THE WORLD THAT SUMMER - 5 - The Standard Gravity of Impending Doom
THE WORLD THAT SUMMER - 5 - The Standard Gravity of Impending Doom
Published: 2015/10/23
Channel: David Norman
Dave
Dave's Hamilton Farewell show - THE WORLD THAT SUMMER - 1 - The Standard Gravity of Impending Doom
Published: 2017/05/30
Channel: David Norman
American Standard - Gravity Push
American Standard - Gravity Push
Published: 2012/06/01
Channel: thievesdont
Neil deGrasse Tyson on Gravity and the Higgs Boson
Neil deGrasse Tyson on Gravity and the Higgs Boson
Published: 2014/11/06
Channel: StarTalk Radio
"Gravity" by Sungha Jung (covered by Phero Ngo) Standard Tuning
"Gravity" by Sungha Jung (covered by Phero Ngo) Standard Tuning
Published: 2015/12/24
Channel: a_bag_of_rice
Science Experiments on gravity 4th standard
Science Experiments on gravity 4th standard
Published: 2016/03/04
Channel: Prithvi Media Creations
THE WORLD THAT SUMMER "The Standard Gravity of Impending Doom" Live at Club Absinthe
THE WORLD THAT SUMMER "The Standard Gravity of Impending Doom" Live at Club Absinthe
Published: 2015/11/03
Channel: stevearnett
1969 Gibson SG Standard-Gravity Music Gear-Demo Video
1969 Gibson SG Standard-Gravity Music Gear-Demo Video
Published: 2011/01/05
Channel: Brad
THE WORLD THAT SUMMER   practice 4   The Standard Gravity of Impending Doom (aka #3)
THE WORLD THAT SUMMER practice 4 The Standard Gravity of Impending Doom (aka #3)
Published: 2015/09/29
Channel: David Norman
Gravity Didn’t Come Standard On This Truck  ..?
Gravity Didn’t Come Standard On This Truck ..?
Published: 2015/04/12
Channel: Meetville Animals
Back In Standard Gravity
Back In Standard Gravity
Published: 2014/11/11
Channel: Liberator - Topic
Gravitation (4 of 17) Calculating Acceleration Due to Gravity (g)
Gravitation (4 of 17) Calculating Acceleration Due to Gravity (g)
Published: 2016/04/30
Channel: Step-by-Step Science
Finding standard gravity using fletcher
Finding standard gravity using fletcher's trolley
Published: 2011/07/14
Channel: Phyo Pyae Sone
Double-standard Gravity
Double-standard Gravity
Published: 2015/05/08
Channel: Emile Therese
TWTS   gillian carter show   The Standard Gravity of Impending Doom
TWTS gillian carter show The Standard Gravity of Impending Doom
Published: 2016/05/19
Channel: David Norman
Does the standard model account for the force of gravity?
Does the standard model account for the force of gravity?
Published: 2017/03/24
Channel: World Science U
AKW - 50mm Standard Gravity Waste - GW50 - 25126
AKW - 50mm Standard Gravity Waste - GW50 - 25126
Published: 2015/10/29
Channel: GoPlumbDirect Limited
Gravity Razer Standard 1.5mm Guitar Pick Review & Demo
Gravity Razer Standard 1.5mm Guitar Pick Review & Demo
Published: 2016/07/17
Channel: Jake Pool Music
PaintballingHD - Proto Primo Gravity Hopper Vs. Standard Gravity Hopper
PaintballingHD - Proto Primo Gravity Hopper Vs. Standard Gravity Hopper
Published: 2011/04/05
Channel: PaintballingHD
Gravity Classic Standard 1.5mm Guitar Pick Review & Demo
Gravity Classic Standard 1.5mm Guitar Pick Review & Demo
Published: 2016/07/08
Channel: Jake Pool Music
Particle Physics Gravity and the Standard Model
Particle Physics Gravity and the Standard Model
Published: 2017/03/31
Channel: Health
Todaysgear Epiphone Les Paul Standard Plus-Top Neo Gravity (Tesla VR-60 Upgrade!!)
Todaysgear Epiphone Les Paul Standard Plus-Top Neo Gravity (Tesla VR-60 Upgrade!!)
Published: 2015/01/21
Channel: todaysgear
Standard Deviants School Astronomy  From Galileo to Gravity
Standard Deviants School Astronomy From Galileo to Gravity
Published: 2013/11/05
Channel: DiamondCraftX Server
REAL LIFE JOURNAL 3 - Gravity Falls - Unboxing Video - MrFreakins
REAL LIFE JOURNAL 3 - Gravity Falls - Unboxing Video - MrFreakins
Published: 2016/07/31
Channel: MrFreakins
Sefind Video: Gravity® Standard (ENG)
Sefind Video: Gravity® Standard (ENG)
Published: 2015/09/10
Channel: Sefind S.r.l.
Husky Spray Gun Kit Review from Home Depot
Husky Spray Gun Kit Review from Home Depot
Published: 2016/11/02
Channel: BigDGuitars -
Gravity Falls Journal 3 Limited Blacklight vs. Standard Edition
Gravity Falls Journal 3 Limited Blacklight vs. Standard Edition
Published: 2017/06/16
Channel: ToriStory942
Cafe Doors Gravity Hinges with Hold Open feature from www.swingingcafedoors.com
Cafe Doors Gravity Hinges with Hold Open feature from www.swingingcafedoors.com
Published: 2013/11/11
Channel: SwingingCafeDoors
Zero Gravity Windscreens Overview and Buying Guide at RevZilla.com
Zero Gravity Windscreens Overview and Buying Guide at RevZilla.com
Published: 2013/01/14
Channel: RevZilla
Stepmania-Gravity-Standard
Stepmania-Gravity-Standard
Published: 2008/07/28
Channel: OjamajoxKaori
Gravity Cat Level 1 Standard Mode
Gravity Cat Level 1 Standard Mode
Published: 2016/07/15
Channel: MatthewA18
Sefind Video: Gravity® Standard
Sefind Video: Gravity® Standard
Published: 2015/09/10
Channel: Sefind S.r.l.
(Sungha Jung) Gravity - Chu Anh Vu
(Sungha Jung) Gravity - Chu Anh Vu
Published: 2013/06/11
Channel: Chu Anh Vu
Su-G Gravity
Su-G Gravity
Published: 2012/11/26
Channel: Colby Hill
Standard Skateboard Truck Co - Gravity Casted Truck
Standard Skateboard Truck Co - Gravity Casted Truck
Published: 2016/03/17
Channel: WoodpekkerSkateboards
gravity forms standard review 2017
gravity forms standard review 2017
Published: 2017/09/19
Channel: WP Business Club - WordPress Reviews and Training
Gravity Cat Level 44 Standard Mode
Gravity Cat Level 44 Standard Mode
Published: 2016/07/16
Channel: MatthewA18
Gravity Bomb 2.0 - Ultra-Budget Standard Deck
Gravity Bomb 2.0 - Ultra-Budget Standard Deck
Published: 2017/03/22
Channel: DesolatorMagic
Gravity Cat Level 9 Standard Mode
Gravity Cat Level 9 Standard Mode
Published: 2016/07/15
Channel: MatthewA18
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WIKIPEDIA ARTICLE

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The standard acceleration due to gravity (or standard acceleration of free fall), sometimes abbreviated as standard gravity, usually denoted by ɡ0 or ɡn, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as 9.80665 m/s2 (about 32.174 ft/s2). This value was established by the 3rd CGPM (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration.[1][2] The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration from rotation of the Earth (but which is small enough to be neglected for most purposes); the total (the apparent gravity) is about 0.5 percent greater at the poles than at the equator.

Although the symbol ɡ is sometimes used for standard gravity, ɡ (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 Earth's gravity). The symbol ɡ should not be confused with G, the gravitational constant, or g, the symbol for gram. The ɡ is also used as a unit for any form of acceleration, with the value defined as above; see g-force.

The value of ɡ0 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 geodetic latitude of 45°. Although the actual acceleration of free fall on Earth varies according to location, the above standard figure is always used for metrological purposes. In particular, it gives the conversion factor between newton and kilogram-force, two units of force.

History[edit]

Already in the early days of its existence, the International Committee for Weights and Measures (CIPM) proceeded to define a standard thermometric scale, using the boiling point of water. Since the boiling point varies with the atmospheric pressure, the CIPM needed to define a standard atmospheric pressure. The definition they chose was based on the weight of a column of mercury 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:

The value of this standard acceleration due to gravity is equal to the acceleration due to gravity at the International Bureau (alongside the Pavillon de Breteuil) divided by 1.0003322, the theoretical coefficient required to convert to a latitude of 45° at sea level.[3]

All that was needed to obtain a numerical value for standard gravity was now to measure the gravitational strength at the International Bureau. 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−2.[4]

This result formed the basis for determining the value still used today for standard gravity. The third General Conference on Weights and Measures, held in 1901, adopted a resolution declaring as follows:

The value adopted in the International Service of Weights and Measures for the standard acceleration due to Earth's gravity is 980.665 cm/s2, value already stated in the laws of some countries.[5]

The numeric value adopted for ɡn was, in accordance with the 1887 CIPM declaration, obtained by dividing Defforges's result – 980.991 cm·s−2 in the cgs system then en vogue – by 1.0003322 while not taking more digits than warranted considering the uncertainty in the result.

Conversions[edit]

Conversions between common units of acceleration
Base value (Gal, or cm/s2) (ft/s2) (m/s2) (Standard gravity, g0)
1 Gal, or cm/s2 1 0.0328084 0.01 0.00101972
1 ft/s2 30.4800 1 0.304800 0.0310810
1 m/s2 100 3.28084 1 0.101972
1 g0 980.665 32.1740 9.80665 1

See also[edit]

References[edit]

  1. ^ Taylor, Barry N.; Thompson, Ambler, eds. (March 2008). The international system of units (SI) (pdf) (Report). National Institute of Standards and Technology. p. 52. NIST special publication 330, 2008 edition. 
  2. ^ The International System of Units (SI) (PDF) (8th ed.). Bureau international des poids et mesures. 2006. pp. 142–143. ISBN 92-822-2213-6. 
  3. ^ Terry Quinn (2011). From Artefacts to Atoms: The BIPM and the Search for Ultimate Measurement Standards. Oxford University Press. p. 127. ISBN 978-0-19-530786-3. 
  4. ^ M. Amalvict (2010). "Chapter 12. Absolute gravimetry at BIPM, Sèvres (France), at the time of Dr. Akihiko Sakuma". In Stelios P. Mertikas (ed.). Gravity, Geoid and Earth Observation: IAG Commission 2: Gravity Field. Springer. pp. 84–85. ISBN 978-3-642-10634-7. 
  5. ^ "Resolution of the 3rd CGPM (1901)". BIPM. Retrieved July 19, 2015. 

External links[edit]

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