Standard gravity

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The standard acceleration of gravity or standard acceleration of free fall, often called simply standard gravity, is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is a constant defined by ISO standard 80000 as 9.80665 m/s2 (about 32.17405 ft/s2), denoted typically by ɡ0 (sometimes also ɡn, ɡe, or simply ɡ). This value was established by the third General Conference on Weights and Measures (1901, CR 70) and used to define the standard weight of an object as the product of its mass and this nominal acceleration. The acceleration of a body near the surface of the Earth is due to the combined effects of gravity and centrifugal acceleration 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 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...

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